Some Thoughts:
USB 3.2 Gen 2x2 will go to 20 Gbps so there will be some better interfaces in the future.
PCIe cards are still the fastest as far as lag and they seem to offer more performance for the dollar.
If buying a system today, I would get a Thunderbolt 2 interface and run it with a PC.
Something like the AX4rt or something from Universal of Presonus because there is already a slot in the rack.
Apple is under powered. Maybe their new chip is something but I'll wait for the bench marks.
PCI-E cards are fast, but they introduce EMI, and there aren't many of those around.
Did you read what I wrote?
I did in no way state that studio equipment is defined by having TB. I just said that _if_ a device has TB it is _likely_ a piece of studio gear.
You don't understand it, there is no set in stone definition for "studio gear". You're making silly assumptions regarding this. There are lower end Thunderbolt equipment meant for the home usage as well. The guy I used to buy second hand guitars and other gear from, owns a mid sized studio. All he got there is a mid range Yamaha USB mixer and a pair of Adam A5X's for the mixing. For playing, he has a very old, beaten up Fender 4x12 cab which he was willing to give me for some 200 bucks, alongside of some old Roland keyboard and a bunch of Strats, Ibanez guitars and whatnot. NOTHING fancy at all. He does own a total of about 200 guitars that include $5000 Suhrs, Tom Andersons, etc... but nobody can get to play them in the studio.
If you look at your "average studio" we're talking about here, you'll mostly see a V67G or similar mic for instance, which is a $150-200 mic some random guy can buy off the Internet. In fact, if you watch Dave Grohl's documentary about the Sound City studio, you'll find out that many big name bands have recorded there with old and beaten up crap almost nobody would pay a dime for.
You seem to think these "studios" ALL seemingly resort to high end gear, but this is false at best and in fact a laughable statement. Back in the old days, people didn't even have good mics down most studios. There would be like one Telefunken somewhere everybody would like to use, and the rest garbage mics. You're lucky to have the gear available today.