Are you kidding me? Metaknight has one of the best, though it is cheap.

Best:Marth(One hit ko)
Worst:Donkey Kong(Requires a field and can't kill because it's just small hits)

best final smash goes to Ike worst goes to Pikachu

TBY...ZSS's final smash can kill. I should know. My brother killed me with it. lol

Best: MY BIG GA- i mean...um....uh....Ganondorf's. Idk. What are we determining as "best"? Best in dealing damage, inhibiting your foes, or just flat out destroying them. Or the level of difficulty in using them?
Worst: ROB's, DK's, or Peach's
Cheapest: Marth's (Zelda's is survivable. I should know. I survived it as Jigglypuff. )

Peach's isn't bad at all. It's instant sleep.

1. Can work as a meteor smash.
2. Most likely to kill opponents on moving stages.

Tbh, all final smashes are decent, you just have to use them properly and not button-mash.

best- sonics. being able to just fly into people and smash them into the floor and fly around is just awesome!
worst- Mr game and watch. I personally dont like how he turns into an octopus... also, little control over the move

Sonic is easy to dodge, and Game & Watch has good range

Game & Watch can be deadly, but on larger stages like New Pork City, not so much.
Stages play a big roll in final smashes.

yea ur right on that one. stages that are larger will be usually harder to get kills on because nobody is really in range

Best in LOOKS: Link's
Worst in Look's: Game & Watch

Best for Power: Marth
Worst for Power: Kirby