I like the features better, flared magwell, forward slide serrations, no finger grooves, trigger, the breech face cut that eliminates BTF and the general look of the gen 5's.
Across the board they are supposed to be more accurate but I've shot a single gen 4 that has turned in some incredible offhand groups.
I don't think it's worth debating which is best, it's a choice, make it for yourself.
