Service on Fox 2.0 is $75 from Fox. Find a local shock tuner shop or private party and it might be even cheaper.
Fox are better shocks than Rancho by far: better pistons, better shims, better oil, better seals, better finish, alum body, better shock shaft, overall better hardware and oil etc etc,. That's why they're more expensive. Fox 2.0 performance series is without a single doubt a better shock equipped with racing components, components that will need to be replaced sooner or later because well,, racing parts do wear as well and they can wear faster the harder you run them. Those parts in turn give you much better control in the rough compared to regular shocks, let alone if you add reservoirs, let alone if you with 2.5 shock bodies.
With that said not everybody needs race shocks and they're not for everybody either. Pick your poison according to your vehicle intended use. Ranchos in the Jeep world have a market and seems to be well established, don't ask me how some can't withstand a speckle of rust in a bumper but seem to recommend shocks that need to be painted right out of their boxes to avoid having them rusting once you get them out of that box

, In all seriousness take a peek outside the Jeep workd for Rancho shocks and see what people have to say about them. I have Ranchos in my garage but don't run them full time. If i need to send my Kings or Fox to be serviced those Ranchos are my backup set.
Running on the street with a close to stock Jeep seems the Rancho 5000's will make quite a few people happy. Fox will be better on a Jeep that has more weight and aftermarket heavier springs as they valved a little faster on rebound and what i think is slower compression compared to a stock Jeep JK shock so they might feel harsh on stock springs/stock weight Jeep. Fox 2.0's are better but not invincible

, if you want a shock that can take serious abuse then you look at the 2.5 and above race shocks. Still, Fox 2.0 (performance series and up) are in a different shock league compare to Rancho's or any other standard shock monotube or twin tube. Make no mistakes. the difference in the Jeep word seems who goes slower. Change the need and put more of your foot in the gas and those Ranchos will puke oil in less than 15 min in any washboard.