I'd say pretty much any fitted with a Mother-ease wrap is 10 times as reliable as any pocket I've tried (unless you want to change nappies every 2 hours, which I don't!). I'm hooked on minkee pockets anyway, but strictly with dresses & babylegs!
I always used to use fleece liners in fitteds to avoid clammy bums, but haven't been bothering so much lately - I do prefer fleece-lined fitteds but we haven't been having any problems with organic velour or bamboo velour, and it seems a shame not to have that nice fabric next to the skin.