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Most preworkouts are just a ton of stimulants mixed with insufficient amounts of amino acids. Despite the hype and all the junk science, it really doesn't matter what you take, as they all pretty much do the same thing. There were things like Jack3d that had 1,3DMAA that actually had legitimate psychological effects, but it has since been banned by the FDA.
If you want proper benefits, you may want to supplement your preworkout with additional doses of tyrosine, carnitine and maybe beta alanine. You ideally want 5000mg of each, and most preworkouts have about 1500mg.
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