It's horses for courses isn't it.
Mabie - happy xc fun for red level riders
Ae - for happy hardcore HTs and people who like fun. Yes there is some fireroad etc but they are slowly making improvements and throw in the shredder which can be ridden as an XC track then it's great
Drumlanrig - very excellent for rooty fun
Kirroughtree - just excellent for fit and not so fit XC riders with some black challenges along the way - lots of flowing singletrack
Dalbeattie - more of a chilled ride
Mabie and Dalbeattie all have brilliant off-piste sections for locals, and Mabie also has the darkside and skills loops with big berms and jumps.
Lots of fun at all the Stanes if that is your bag, if not then no probs either!
I always enjoy the start of Ae too.