Reverb is good, bound to get lots of comments about reliability (personally mine have been fine, but lots of people have issues), but SRAM’s backup is good.
I’ve got a transfer (external routing) on my hardtail and have found it to be smooth in action. I ended up going for the bontrager lever (18 rather than fox at 50) and it’s easy to route and light in action. I can’t comment on reliability as I’ve only had it a little while but fox posts have generally got a good reputation for reliability, with good backup from Mojo.
If you think the hydro aspect is annoying and want the simplicity of cable then go fox, otherwise I’d probably just buy the cheapest.