You pick a company that you know will have done some decent research, not someone who just pattern copies these companies with crap spec materials.
Eibach and H&R seem to favour a staggered approach with a smaller diameter rear bar and get very good reviews. The Yank ones like Neuspeed and Autotech go for matched front and rear diameter.
I have the Autotech ones and the car is very neutral. I've had H&R in the past on other cars and they were exceptional quality too. Stick to one of those 4 and I think you're fine.