The way I see it, Fox/Puff is by far the best team composition. They in fact do complement each other quite well; the only unfortunate thing I can see (for Puff in this case) is that Fox's lasers will not wake up a sleeping teammate. However, he's fast enough to the point where he can dash over and do a dash attack or jab or something where it's not really a problem unless there is an enemy Fox in range. Even then, that's not that bad of a trade.
Fox has great ground movement and great grounded options, and he has a wicked vertical KO move. Puff has crazy aerial dominance and really good horizontal kill options. Even Fox doesn't have a bad air game, and Puff isn't entirely useless on the ground (but let's get back to the point). Both characters are fantastic at gimping, and both have good recoveries. The Puff can even help out Fox's recovery if necessary.
If Fox gets a grab at decent % with a nearby teammate, Puff can get an easy rest. Likewise, Fox can upsmash Puff's grabbed victim. Even then, they are not grab-heavy characters to the point where it is almost immobilizing (see: Falcon and Sheik in doubles -- not bad by any means, but rely on a lot of grab setups regardless). They can juggle opponents pretty well, and can do some cool carry combos, e.g., Fox gets a back air, opponent is about to land in hitstun right by a grounded Puff, Puff fsmashes. Stuff like that is amazing in this comp.
I really see no downside to the Fox/Puff comp. other than the fact that Puff still dies at 60 and Fox can get gimped pretty early in a 1v1 split situation. 4 Leaf Mango has shown time and again why it's such a good team.
Fox has great ground movement and great grounded options, and he has a wicked vertical KO move. Puff has crazy aerial dominance and really good horizontal kill options. Even Fox doesn't have a bad air game, and Puff isn't entirely useless on the ground (but let's get back to the point). Both characters are fantastic at gimping, and both have good recoveries. The Puff can even help out Fox's recovery if necessary.
If Fox gets a grab at decent % with a nearby teammate, Puff can get an easy rest. Likewise, Fox can upsmash Puff's grabbed victim. Even then, they are not grab-heavy characters to the point where it is almost immobilizing (see: Falcon and Sheik in doubles -- not bad by any means, but rely on a lot of grab setups regardless). They can juggle opponents pretty well, and can do some cool carry combos, e.g., Fox gets a back air, opponent is about to land in hitstun right by a grounded Puff, Puff fsmashes. Stuff like that is amazing in this comp.
I really see no downside to the Fox/Puff comp. other than the fact that Puff still dies at 60 and Fox can get gimped pretty early in a 1v1 split situation. 4 Leaf Mango has shown time and again why it's such a good team.