I have not. Some (very few, it seems) people prefer the very low profile of the butterfly. It’s also hard to say if the 2019 butterfly revision still had reliability issues.
Most people seem to enjoy the extra key travel of the scissor. This is subjective; it depends on your posture, “medical history” if you will, etc. But I think by and large, the butterfly keyboard struck a poorer compromise.
That said, no, I’ve never typed on one.
It sounds like you’d enjoy the additional key travel.
Again, though, that’s subjective. All I can say is the consensus seems to be the new Magic Keyboard strikes a better balance, and Apple seems to want to kill off the butterfly sooner rather than later. In part because of reliability issues / lawsuits, maybe, but perhaps also in part because few people seem to love such low travel.
If you're unsure, getting someone else's opinion on this probably won't help much. You gotta try yourself. (There's also a return policy, I suppose.)
You’ll get better longevity from either the Air or the four-port, because both have much newer CPUs. The two-port seems to exist mostly as a “see? The Pro starts at $1299” proposition. It's not an awful computer, but I don't see it as a particularly good choice — if the $1799 Pro is a bit much for you, go with the Air (configured upwards from the base model), but either way, don't go with the $1299 Pro.
I have no experience with it myself and am a little wary of moving to it.
It seems few people outright love the Touch Bar. It also seems Apple hasn't quite figured out what to do with it / how to spread it to the rest of the lineup. What if you're on an iMac? What if you use a MacBook Pro, but for ergonomic reasons, want an external keyboard?
Tools to make it more powerful exist, like
https://github.com/Toxblh/MTMR/ and BetterTouchTool
https://folivora.ai.
Brightness helps a lot outdoors, and also in environments with stark lighting conditions, given that there's a fair amount of glare due to the glass panel. So I think it's a bit of a shame the Air isn't as bright.
A few things on this…
"i7" really just means "the highest (or sometimes second-highest) tier within a series". What in particular that means depends a lot. But yes, generally speaking, given the same thermal constraints, an i7 is meant to be (slightly) faster, and therefore will run hotter.
Second, upgrading from the i3 to the i5 on the Air is absolutely worth it at $100 (you go from a dual-core to a quad-core, and there will be situations where that's welcome). Upgrading to the i7 for another $150, much less so (it's still a quad-core, only at a slightly higher clock).
On the Pro, you start with an i5, and the only option is to spend $200 on an i7. Both are quad-core, and you'll barely notice the difference.
So, in these two cases, I would pick the i5 no matter would: it runs slightly cooler, and it saves money that honestly isn't a good bang for the buck. (But don't go with the i3.)
The final point: much of the heat comes from temporary bursts of high clock, which Intel does opportunistically when it seems warranted (i.e., when a brief, fast computation helps performance), then scales back down as soon as power draw or temperature limits are reached. (This is marked as "Turbo Boost" and "Thermal Velocity Boost".) But, if you find the resulting heat (or fan noise!) annoying, there are tools to disable this behavior altogether or configure it to be less aggressive. See, for example
https://www.rugarciap.com/turbo-boost-switcher-for-os-x/ (my understanding is only the automatic features cost money). I don't personally use such a thing, but it is my understanding Marco Arment does.
You can also approach that from the opposite angle — I personally have iStat Menus, and occasionally, for a few minutes, use it to deliberately drive the fans at a higher speed than the OS would, just to cool my Mac down a little. There are various tools that allow that.
The Air isn't fanless (unlike the 12-inch MacBook was).
At similar usage, the Pro is likely to be quieter and/or cooler, simply because it has more room inside to dissipate heat.
I think it's gotten better. In 2018, it was really confusing in the $1000-2000 range whether you were supposed to get the 12-inch MacBook, the 13-inch Air, the 13-inch Pro with just two ports (which at the time had various weird differences compared to the other Pros), or the 13-inch Pro with four ports. Not to mention all of them had a highly controversial keyboard that most don't seem to like to type on, and many seem to have experienced serious reliability issues (keys getting stuck, typing multiple times, etc., with the only remedy being replacing the entire topcase!). It made it really hard to confidently recommend
any portable Mac at all, for multiple years. That sucked.
They changed the keyboard, killed the MacBook, and made the two-porter a bit less out of place (added Touch ID, etc.). I still think they should kill that altogether, though.
Today, right now,
both the Air and the four-port Pro are fine purchases. They've both been upgraded in recent months, and don't seem too pricey for their value to me, by Apple standards.