If I understand correctly, your 13" Macbook pro has 8GB of RAM, and you do recording, right? (SSD 128 or 256?)
How well does it handle Logic Pro?
And do you do any video editing?
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Will 16GB of Ram do better for simple video editing (for Youtube), recording music & running Windows on bootcamp?
That's all I plan to do, will 256GB SSD be enough? Is 16GB of RAM too much for my daily work?
You understand correctly, haha. Yes, I have 8GB RAM and 128GB SSD. I will address storage first. Right now I have 61.68GB of the 128GB available and most of the used storage is from my MASSIVE iTunes library. Everything I edit goes onto a "Western Digital My Passport for Mac" so I save a lot of space using that plus thumb drives for other things and now iCloud Drive which I really like for storage in the cloud.
Performance: My MacBook Pro handles Final Cut Pro X absolutely fine, no hangups or anything. I cannot speak to Logic Pro because I do not use it, but since Final Cut Pro X definitely requires more system performance than Logic Pro, I imagine it would handle it perfectly.
Also, I just want to let you know I pay $2.99 a month for 200GB of iCloud Storage. So that handles my iCloud Backups for all my iDevices (which does not take up much space at all) and the rest is for iCloud Drive storage. Take advantage of it.
http://www.apple.com/icloud/icloud-drive/
I say go for 16GB RAM (just because you cannot upgrade it at all) and it will help with your video editing and what not. I also say save money and go for the 128GB SSD IF you are going to take advantage of external and cloud storage. If you are not going to take advantage of external/cloud storage go with the 256GB SSD.
Honestly, 8GB of RAM would be enough for you, but like I said since you cannot upgrade it, go with the 16GB of RAM and your MacBook Pro will last even longer.
The i5 2.7GHz is a really nice chip, and when that Turbo Boost kicks in you can definitely tell.
I hope I have helped you make your decision. Let me know what you do! Good Luck!
Edit: I also do store some of the videos I edit in iCloud Drive because then they are available on my iPhone 7 Plus, iPad Pro 9.7", Retina iPad Mini 2, and my MacBook Air. Also iCloud Drive is supported on Windows, so it is a win-win.