j.hp does indeed get blown up by Guy’s air grab, but from what I can tell in that MU there’s no solid AA option against him, you pretty much have to do your best to deal with his jump-in/mixup, find a way to KD him and keep him down. he wins the mid and long range game, and close range too as long as he has advantage.
U2 doesn’t have U1’s utility in the vast majority of matches, but I think there’s at least one where it’s preferred and several debatable. Makoto I can’t see any reason to use U1, she doesn’t need to jump at you apart from instant axe kicks, she can axe kick over booms so she doesn’t need to focus them (can’t even boom if she has U2), only use I can think of is to OS her backdash but ex.legs would cover all her options too IIRC. U2 gets you extra damage in corner, very easy to setup chipout in corner, and if you’re going to react to her instant axe kick, it’s a lot easier doing it from back/downback position than qcf or dpm.
Other matches I like or consider U2:
Seth - Burst damage and AA. I thought this MU was for sure U1 til I saw Dashio vs Poongko and how little U1 did for either of them, they both ended up picking and sticking with U2 like 10 games into the 200 game set. The mirror is just stupidly explosive, U2 guarantees you an extra 10-15% more damage than stomps, and yes it’s only 10%, but there’s SO many comebacks that can result from that 10%. Plus it doesn’t matter that Seth gets no setup off U2, Seth forces himself to guess even on his own U1 mixup, it’s all just a bunch of randomness.
Akuma - only if I have an extraordinarily good read on my opponent’s teleport timing, otherwise U1 for sure. Ex.flip tracks so it’s an automatic U2, but I’m not even concerned about that since if you’re already sitting there baiting flips you can meet him air-to-air with j.mp regardless. It’s the instant air ex.ball that he uses to force his way in and lands in front of you with advantage, absolutely cannot guess wrong here or you’re eating throw or combo/OS sweep and you get vortex’d to death. Having U2 means even if I’m without meter I’m not stuck in that situation. Plus, I’d much rather use meter on boom FADCs, whether it’s for big damage combos or in neutral game to catch him abusing st.roundhouse.
Viper - mentioned, plus easy to setup corner chipout. It’s possible to tag even her crossup j.hk if she does a late timing to beat DPs, she almost has to be purposely baiting by doing early obvious crossups or empty jumps on your wakeup to 100% avoid U2, then your ultra suddenly has the added utility of a counter ultra lol
Sagat - this one’s probably U1, but I absolutely fucking hate how U1 trades 90% of the time vs heavy or ex shots at fullscreen. invincibility doesn’t kick in when you don’t have any screen to push back on during that locking period, and you just took free damage and wasted ultra. The only way to catch it is before the ball leaves his hands, Guile style, but if you’ve got that good of a read on him might as well just walljump.
Rufus - Doesn’t ball, doesn’t jump high.
Again though, I think U1 is the straightup better choice in most any other MU.