With a well structured manabase, and some ramp to smooth out fixing, you should be able to cast your cards on curve consistently
That really depends on what matters most to youtime or money
Craterhoof Behemoth The best go-wide finisher If you've played against any kind of green go-wide deck in Commander, and especially if you've faced an elves deck, you've probably seen a Craterhoof Behemoth
The backside, The Grand Evolution, puts creatures from your graveyard into play, distributes some +1/+1 counters, and lets your creatures fight others for just mana
The notion of "the best" is subjective, depending heavily on your criteria: raw power, format dominance, historical legacy, or even sheer financial value