pulling the seatpost just to work on the bike is silly. With a PRS-20 style, you drop off the front wheel, pop it on the stand and it's strong and stable.Try torquing a bottom bracket on a seatpost-clamp stand. Have fun with that!
Its not that hard, really. Swapping seat posts not appreciably more complicated than removing front wheel and I can get plenty of torque on BBs. That said, PRS-20 looks like a nice option