i was talking to my friend swordgard and came to the conclusion that yoshis is not the greatest stage vs mk, given the high base knockback of shuttle loop and the short sides. dair camping also ***** on yoshis.
the only real benefits are a) that mk can't really kill you with upairs because of the high ceiling, but you only kill him like 6% later, and b) that you don't *have* to tech a shuttle loop off the stage cause it doesn't send you down.
i personally prefer any neutral to yoshis.
also on the note of halberd grounded shuttle loop and upair **** at very low percents, so its not as great as it might seem. you might kill mk 10% faster, but he kills you 20% faster with up air. i guess in that situation it comes down to who kills first. anyway just saying its not so obvious that stages with low ceilings are good for snake. i do personally like it though, especially the second transformation.