You can do fbss with a 2 pump setup but, you just won't be able to lift each individual wheel. As for reliability I think that they are the same as long as it is a good install. They both have their pros and cons though. Like with hydraulics you have to charge the batteries unless you have a street charger. Air you have to wait for your tanks to fill up. I know a lot of people say bags ride better and that is just beacause you usually relocate the shocks and with hydraulics most people don't. I have ahd both and if you run 2 ton coils all around with accum. then your ride will be just as good. Try riding in a car with bags that doesn't have the shocks put on yet. It rides worst then my cutty does with 3 1/2 tons up front and 2 tons out back. If your tryting to lift and lay then I would definately go with bags or if space is a concern cause air does take up a tad less space but, other than that I would have to say juice. Anyways, sorry for making this so long I just wanted to add my opinion.