Ok for those who wanna know what jin's capable of, i'll run down a few things he can and have done throughout the main title tekken titles (story, in game, etc)
Spoiler, click to toggle visibilty
Now in terms of scaling....Jin is literally at the top of tekken next to lars who he stalemated with (a man who literally defeated almost all of the cast and henchmen in T6), He's beaten kazuya and heihachi simultaneously(both have stalemated with akuma and survived raging demons. with kazuya fighting shin akuma in the bonus stage of tekken 7)
Since Udon street fighter comics are non canon, Ryu currently hasn't managed to defeat shin akuma or base akuma in any main title.
however if we were to add non canon feats to both of them( asuras wrath, blood vengeance and TTT2) Jin's feats still outweigh ryu's... as ryu got his shit rocked by asura and base akuma
I'm going for jin