Can't comment on the Thule Ranger 90 I'm afraid - I use a Kamei Corvara 390k Duolift on mine (can highly recommend it ... bit pricey but well made, easy to fit, opens both sides and unlocks/locks really easily and quiet at all the speeds I ever travel at!)
I do however have Prorack Whispbars fitted and I can highly recommend them. They make no noticeable difference to wind noise or MPG, are well made, adaptable, fit the Yeti's profiled roof rails and are quick to install/remove. They're also quite low profile so roofbox, bike carrier etc. don't stand too high off the roof. Again, they were a bit pricey but I don't regret paying a bit extra for something decent.