Whats better about it
Guff Rewrites History gives them spells to cast
Haste to let you smash, and safety from counterspells
For example, here are some Commander Classic prices: Farseek - 1.99 - heavily printed and common Rhystic Study - 37.99 - common in initial set, heavily printed Dockside Extortionist - 64.99 - Rare in a few sets Sun Titan - 0.75 - Heavily printed as mythic and rare See how a rare Commander Classic Sun Titan is massively cheaper than Farseek which is a common
The different leaders have different strategies, so one can focus on expensive spells and you can build a more control-oriented deck, while other leaders swarm the battlefield with smaller, cheap creatures that can give you an edge early in the game, and so on
The mana requirement here is steep, and you should really never expect to actually play it on turn three, but with the kind of mana it can produce, playing it later wont be too shabby either, though you do probably need some mana sinks to find use for the mana