Poltergust
Smash Master
OK, this I'll have to disagree with. The only time that Yoshi should be using his u-air in this match-up is for when he KOs Link. Link CAN'T be juggled by it because his fast-fall speed is too great and he'll most likely retaliate with a d-air, which is hard to fight against unless you have PERFECT timing with your u-air. It is just not worth it.The final character advantage I'll be discussing in this matchup is one that I wish Yoshi had in this matchup, but just doesn't. Consistent power. Link has it. All of his moves. Powerful. Consistently. Yoshi does not have this. Yoshi has burst potential from up aerial and forward smash. Up smash and neutral air are Yoshi's only really consistently powerful moves. Everything else besides up smash and neutral air deteriorate too quickly to guarantee KOs. Link can tap on your shield all day with whatever he wants and still be able to hit Yoshi with weakened moves that are capable of KOs. Link is certainly no Snake (who can KO with every single A button move in his arsenal), but Link has plenty of power covering a wide range of moves and they all have decently consistent power, even as they degenerate.
Yes, Link is easier to hit with Yoshi's f-smash than most characters, but even so the deterioration rate of the move wouldn't matter much because then it leads to an easy gimping. Like I said before, just one n-air or d-air and Link is history. He's just too easy to gimp. And Yoshi's up-smash deteriorates at a faster rate, from what I see.
You are also forgetting a grounded Yoshi Bomb. That move would kill Link at around 150% or so.
Link actually doesn't have much killing power outside of his f-smash, f-tilt, d-air, and d-smash. All of them are easily avoidable if Yoshi sticks to the air. Link can't pressure Yoshi's shield (even though he shouldn't shield, but I'm just throwing that out there), but Yoshi can easily pressure Link's with d-airs and b-airs.
Link also has just too many laggy moves that Yoshi can capitalize on. Link whiffed an up-B? Half-charge your f-smash. Managed to shield the first hit of Link's f-smash? Dodge the second one and Yoshi Bomb. Link whiffed his d-air? ALMOST FULLY charge an f-smash. What moves does Yoshi have that Link can easily punish?
Yoshi also has a better projectile overall. Link will not win a range game. His Gale Boomerang and Bomb don't reach as far as Egg Toss, and his Arrow is too slow and easily avoidable by jumping. Link's DACUS won't be able to reach where Yoshi is, either (but it would at least close the gap). The best place for Link is medium-range, but if Yoshi is always on you it'll be impossible to consistently stay within that range.
Don't forget about Yoshi's chain-grab and follow-ups when Link is release at the edge. With all of this in mind, I just can't see this at Link's advantage. Neutral at best for him, but I believe that it is Yoshi's advantage here.