Depends how low you wanna go I guess. If you would only put JOMS on at a similar stance to what the sportlines would give then id just go for sport lines. I imagine they'd be more comfortable, but I've not been in a car with JOMS! Mines on AP coilovers and I'm really happy with them now
My only reason to get coilovers is because I think the rear sits slightly too high and to me it doesnt look particularly low on sportlines, then again I havent seen them in the flesh. Im bad at making decisions at the best of times haha