photography noob here looking to get into it same question.
What is best bang for buck when it comes to image quality, DSLR or Mirrorless?
I care not for bulkiness I mean I am a gymnast I can lift my own body weight easily so I am not gonna wuss out if it is going to sacrifice quality for a good price. I know the OMD provides amazing quality but is a cheaper DSLR than that going to get me same or better?
Basing my priorities on this:
Image Quality >
Price >
Features >
Size
I researched for months before deciding last November on a Sony NEX 6 mirrorless camera. To answer your primary question, there is no difference in image quality between DSLR and mirrorless cameras. That said, there are differences from model to model in both categories. Pretty much every DSLR and mirrorless camera sold today is capable of taking excellent pictures. There is no perfect camera; each has its strengths and weaknesses, so it comes down to your priorities and budget. Image quality is a function of camera sensor, lens, and the processing algorithms in the camera (the last of which applies more to JPG than RAW images).
For example, the Sony NEX 6 mirrorless and the Nikon D7000 DSLR, both of which are excellent cameras, use the same 16 Megapixel APS-C sensor, which Sony makes. You can spend a little more and get a camera with 24 MP. That will produce bigger files, and pictures with more detail, which is useful if you want to print poster-size photos, or if you crop your photos heavily and blow them up to larger sizes. The trade-off is that 24 MP sensors produce noisier images at high ISO settings in low light. If you want both maximum detail and low noise for low-light/high-ISO photos, you need to get a full-frame camera. In general, they're considerably more expensive than either APS-C or Micro Four Thirds crop-sensor cameras. Given that I was on a limited budget and value low-light shooting over making huge prints, I opted for a 16 MP camera.
Then there's the lens. Most cameras are available with a kit lens, which usually is of medium quality and is moderately priced. You can get better image quality by buying better lenses, which can cost more than the camera body itself. My Sony NEX 6 cost $650 for the body alone, or $800 for the body and a 16-50 mm kit zoom lens. I got it with the lens, and I'm happy with it. There are Carl Zeiss lenses available, which people say are amazing, for $1,000+. Maybe someday...
Just because you
can lift a big DLSR and, perhaps eventually, a bag full of lenses (which are bigger and heavier than lenses for mirrorless cameras), it doesn't mean you'd necessarily
want to over time. I did fine for 15 years with a 35-mm Minolta Maxuum film-based SLR and a back pack full of lenses, a flash unit, film, etc. When good-quality digital point-and-shoot cameras started coming out in 2001, I mothballed my SLR rig in favor of a Nikon CoolPix, which I upgraded to a Canon PowerShot in 2005. They produced photos that were good enough for me at the time, and I didn't miss the weight and bulk of my SLR rig, especially when I traveled. Last year, when I decided to upgrade to one of the much-better cameras that are available today, I realized I missed the creative flexibility of an interchangeable-lens camera. I came close to buying a Sony SLT-A65 (which technically isn't a DSLR but is the same size and weight as most DSLRs), because it would accept all of my old Minolta lenses. But I remembered why I'd abandoned my old SLR in favor of a point-and-shoot, and the small size and light weight of the NEX 6 won out over the slightly lower price and slightly bigger feature set of the A65.
DSLRs do have advantages over mirrorless cameras. Because the bodies are bigger, most DSLRs have more controls on the body, which means less wading through complicated menus to change settings. You can take more shots with a single battery charge on most DSLRs. If action photography (e.g., sports) is a major interest of yours, DSLRs focus more quickly, although I'm not sure all of them do, so read the reviews.
Once I'd decided on a mirrorless camera, I narrowed it down to the Sony NEX 6 and the Olympus OMD EM5. The EM5 is rated better in a couple of areas. The NEX 6 is better for video, which is important to me. The EM5 has weather sealing, which is a nice feature, especially here in the rainy Pacific Northwest. But Sony dropped the list price on the NEX 6 and also put it on sale last November, so it was $300 cheaper than the EM5, which ultimately clinched the deal for me. What I really wanted was the EM1, but that would have cost $1,000 more than my NEX 6. And if I was going to spend $1,800 on a camera and lens, then I might as well have waited for the full-frame Sony A7, which was about to be released, for $2,000. It can be a slippery slope. Ultimately, I'm thrilled with my NEX 6.
For you, if you're 100% certain that you don't care about smaller size and lighter weight, then a DSLR will give you a few more features (but not necessarily better image quality) than a comparably priced mirrorless camera. Had I not had a collection of Minolta lenses, and had I not cared about size and weight, I probably would have gotten a Nikon D7100, which gets outstanding reviews.
A couple more things: If you're looking into interchangeable-lens cameras, you're going to be buying into a system. Camera bodies will improve as technology improves, but lenses, flashes, and other accessories likely won't improve much. If you buy good lenses and other accessories, you can upgrade to better future models of whatever camera body you buy now, and you won't need to sell those accessories.
The last thing: Don't pay too much attention to the opinionated spec-obsessed posters on the various forums, especially if they claim that one brand or model rules, and all others are crap. Yes, Camera X might do slightly better than Camera Y on the corner of the text chart in low light at ISO 6400 when the corner is blown up to 500%, but under real-life conditions, that won't matter. Camera Y likely will be slightly better in some other area.
Good luck on whatever you decide!