So depending on situations you'd be using T3, T4, T2, T6, and ST3 the most... And probably in that order give or take a few positons with ST3... T3 interrupts almost everything thrown at you rather quickly and would be used most often because of that even though you're at -frames depending on what was going on... T4 I chose second because it can track in some common situations, it's an Unblockable and might not be used so much if it wasn't, It teleports early-mid during it's execution which can be a plus, but being steppable if not used correctly kicks T4 down a major notch... T2 would be third for me at least, I don't use it that often, when I do ussually I'm glad I avoided that move, but it can be difficult to capitalize on the opponent after evading a move, because of that, this tekken move is one of the few that requires practice in mastering it (making it third on my list)... Next is T6, personally I think it could be tied with T2 for third, I would use this against close range characters like Taki, it's good for escaping PO and Hover followups... It's situational, knowing when to use T6 could save you from big damage, and remember if you keep attacking afterward this move could leave Yoshi very unsafe, you have to wait for things to settle out and maintain you're distance from the opponent until you can get back in for a mixup... And then there's ST3, I didn't put this very high up on the list because it can only be executed towards the last 3rd of a standard match, last quarter on an 80 sec. match... Because of that and the certain situations in which it's guaranteed, this tekken move would be last on my list of the most useful but as Hajime said ""this move can win games", and this is the list of my beliefs in which of these attacks are most useful, so please feel free to use this as inspiration and list your own...
