Which one is better and why?
For me, I think the droids are better simply because their a lot quicker to make, you don't have to train them, you can just program them and unlike clones, you don't have to take the time to raise them.
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Because droids would've won the Clone Wars against the obviously better outfitted Clones. Droids are just wiring and programming. Clones are the physical embodiment of the Mandalorian war culture. Droidekas? Barely any arguing point. Their shields are laughably weak. The droids simply lacked an air game. They're only advantage? The fact that they could have a new droid up as fast as a clone could shoot the old one.