I went from a M1 13" MBP first to a 16" MBP Max with 32GB RAM and 32 GPU. The 16" was really fast. Just for daily tasks - web surfing, email, chat, slack, zoom, etc. there was almost no delay in any of the actions. I never maxed out the 32GB of RAM. I actually found myself working more because things were just moving so quickly.
However, the size of the machine didn't work for me. I like to move around the house with my laptop, and I got into work. It was pretty unwieldy as a portable device.
So I downgraded to a 14" MBP Pro 16GB RAM, 16 GPU. It's definitely not as fast but faster than my M1 13" MBP.
I have maxed out the ram, but the machine is still pretty snappy. There are some delays that I see compared with the 16" but pretty small and still better than my 13".
Whether you go with the 14" or 16" you'll get a better keyboard - this new one is more responsive and easier to type on. A better screen - brighter, things seem clearer with more contract (prob the mini-LED), and more screen space. Depending on whether you go with the Pro or Max, you'll get a faster machine.
If you have the money, I would recommend the upgrade.
I can echo a lot of this. I also went with a 16" device initially, and now I'm settling with a 14" w/ 16GB RAM and 1TB storage. I initially went with 32GB RAM and 2TB storage, but found that I didn't need to spend that extra $1500.
It is not any slower with my use case, and even though I hit swap a few times, it's a very small amount. My memory pressure doesn't seem to exceed 65-70% on average.
The 16" Pro is unexpectedly... much more unwieldy than I thought. It's not a significant weight bump compared to the original 16", but the combination of extra heft + the new form factor being slightly bulkier and thicker makes the machine feel... much more substantial than it actually is. It's kind of insane.
In contrast, the 14" is indeed the sweet spot between 13" and 15", and the new screen is much better than either. Even reducing the 14" to the same retina resolution as the old 13" or 15", I didn't seem to lose any of the extra sharpness, which is a very welcome thing as I have to squint to see texts at default.
All in all, I think the 14" is the much better device for portability. The M1 Max 16" actually ran a bit hotter than the M1 Pro 14" from what iStat is telling me. Also I feel like I'm getting slightly more battery out of the 14". It's not comparable to the M1 Pro 13" that I had, but I don't feel like I'm losing much. Maybe at most 1 hour, but I'm already getting well over 10.
Even better than the 2015 MBP / MBA?
Oh, this is an interesting question. So I went back to the 2015 15" briefly and compared the 2. To me, I've found that the 2015 keyboard:
1. Has slightly more key travel
2. Is slightly more clicky
3. The feel of each key is a bit smoother, but that may be due to long usage
In comparison, the new keyboard:
1. Has slightly bigger keys. It seems like each key was made slightly larger?
2. Still clicky but the click is very soft, and is almost inaudible. It's... more stealthy?
3. Backlight doesn't highlight the keys as much (leak around each key) but the characters on the keys are clearly visible and they seem much bigger compared to the old keyboard, so to my eyes, it almost feels like the new keyboard... pops more?
So I think 2015 keyboard has better tactile feedback but is louder overall. The new keyboard still has good tactile, but it is much more muted both in looks and in how each key types. And yet there's more key travel, and my wife also is not bothered by my typing late at night anymore, so I think this may be better for my use case overall.