Personally I like Nobby Nics, roll fast, lightweight with a reasonable level of grip in almost all conditions.
I have 2.1s on my hardtail and 2.25s on the full sus and can't really distinguish much difference. Going to try the 2.25s on the hardtail to see if it gives a bit more comfort this year.
Racing Ralphs also supposed to be good as an alternative the NNs if it's drier conditions. I'll probably give them a go this year at some point.