MEK works fanstastic on both styrene and ABS as I recall.It might melt the styrene a bit more,but it welds the plastics very well.Not to repeate things alreadys said, but ABS is more durable than styrene and styrene would probably be easier to work with.The only downside to ABS is the funky texture on the opposte side,so if that is a deal breaker to you,then I'd use the styrene.