Marth vs Puff: alternate kill setups

vs grounded puff at 45-60%, low dair combos to pivot fsmash.
If puff DI/SDIs too high then you can react with dash JC tipper upsmash.
If puff DIs over the ledge you can FH dair.

From 60%+ a smash attack isn’t guaranteed depending on her DI but you can FH/DJ ff dair then techchase.
On platform stages, over this % range whether she will hit the platform depends on her DI. As such, it's best to assume that she won't and simply switch to a techchase in the (somewhat rare) case that you see she will clearly hit plat.