i was a former autoglym user myself. however changed to meguiars last year. it all boils down to what kinda of finish you want and what sort of condition your paint is in. and of coz how much effort you would be willing to put into it. :P
I have no complaints for the autoglym. it works well and the egp is wonderful (only if used properly).
however, meguiar's gives me a better looking finish and hence now I am a meguiar's user. haha if i can find something else that is better than meguiars and also easily available in the market, i wouldn't mind giving it a try.
for a basic detail meguiar's style you would need to use a clay, paint cleaner, polish and wax. thats 4 steps and the paint cleaner, polish and wax require some rubbing. thats the not so fun part. some of us uses more than these 4 basic steps.:P
a basic autoglym detail would include a SRP followed by EGP. depending on how you use the EGP it requires minimal work to apply (more like wiping the car with a 'wet' cloth...) and buffing it off later.
much simpler rite? and less work. however my personal opinion is that the shine and depth i get from autoglym is less as compared to meguiar's.
oh and Eneos is now selling GC wax for only 58 ringgit. a real good deal. :P