Based on stats alone, you'd think Alakazam is better. It hits faster and harder.Again, what is more viable, Mega GEngar or Mega Alakazam and why? because stat wise Alakazam seems better. Also what do you do on yoir first turn because you are usally outsped when you mega Evolve, would you use subsitute that turn?
But Gengar's got a lot of things going for it. It has a safe switch in with levitate which is really useful for avoiding earthquake, spikes, and maybe most importantly, sticky web, on top of its immunity to normal type moves and poison. Also ghost type moves have better coverage than psychic type moves - only resisted by
Finally, Gengar just has a lot more options to choose from, including substitute, disable, pain split, trick, taunt, will-o-wisp, and so many more. This is amazing compared to Alakazam's measly calm mind or substitute sets.
When all things are considered, I'd say Gengar is the clear winner.
And for your 1st turn, I don't know what to say but get that substitute up or start Gengar off on opponents he out speeds.
			
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