Sonic's is one of my faveourite Final Smashes, as well as probably the most lethal in the game, due to its high manoverability and rather strong knockback. I've seen Super Sonic take out the same opponent twice in one transformation because the opponent moved off of the recovery platform. Marths's is a close second for the almost guarenteed KO aspect of the attack, plus it can hit all enemies and can cover large ground...if possibly too much ground.
As a side note, I personally find it odd that a CPU Wolf will almost always KO himself with his Landmaster. I once had a Wolf SD with it, then get a pity Final Smash only to SD again...in the exact same way.
By ozzo
Mission debriefing:
Now available