I have not tried Alpha-GPC, but I am aware that it is similar to CDP Choline. From my own reading of the many comparisons of the two, CDP Choline is supposed to be the more effective, safer, and cheaper one. I might try Alpha-GPC at some point, but right now I'm pretty happy with CDP Choline.

I'm not super gung ho on experimenting with nootropics in general, and try to be very conservative and err on the side of caution. There are all sorts of different nootropics out there that sound really cool, but I'm just not very much in to using myself as a guinea pig for them. So I don't try a lot, and when I do I go for ones that are known to be super safe and widely used.