Thats a loaded question i am afraid. What suits one person, won't be liked by another. It's a bit like what saddle. Sometimes its down to trial and error. I have tenn shorts costing £15.00 and flab costing £70.00 and to be honest i prefer my cheaper ones. The padding is better and more comfortable.
I have heard that Rapha are good as well. Good luck finding the ones that suit you.