What a question and the reason I say I run two bikes with Ohlins and another with Wilbers the mistake most folks make when comparing is do it like for like ie with separate compression/rebound/remote preload ajust or just make sure they are all the same spec

So having to admit that I have an addiction for aftermarket suspension I actually rather like the stock stuff on the XT my rear shock is very stiff(I'm 12st) which I actually like, the front I guess could be a little more progress and feels rather crude but at the same time I don't want squidgy it's not a motocrosser,it has a tendency to jump around a fair bit when pushing on in a Welsh country lane which adds to the fun as opposed to having a front and rear moving too much.

As for the 3 shocks you mentioned assuming they are all the same spec it would take a brave man to split them and I'd be more inclined to go for the one that is closer to home in case you need some after sales service/help,and of course when ordering make sure they supply a shock/spring for your weight.