Dunnit, it all depends how good the 3/4 g connection is in your friends area, if it's rubbish then that facility is redundant. Personally I'd go with wifi only and shop around for a cheap broadband package, but that's my humble opinion, plus the device itself is a lot dearer for 3g £80-100 more.
A visit to the Apple shop with your friend, if there's one near you wouldn't be a bad idea, he'd get proper advice and be able to have a good play with the iPads.
Good luck :)