Which tastes better, magnesium citrate or golytely (polyethylene glycol)?

Taste is subjective: Taste is a personal thing. No one prep taste good to everybody.

Depends: Which is better, chocolate ice cream or vanilla. Taste is very subjective. Most people will prefer the GoLytely (polyethylene glycol) initially but start to dislike it long before the gallon is gone. Magnesium citrate is worse intially but there is much less of it. Magnesium citrate also causes more cramping in most people.