Reliability isn’t the issue per se for me, it’s running cost and ease of service.
None of them have serviceable pistons AFAICT, but some you can service the sliding parts at home and some you can’t.
I have 2 brand-Xs to replace 2 fox transfers. It’s clear that the brand X posts are not as good as the Fox, but they’re certainly not poor quality and an entire replacement bush, keys and seal set for the ascend is £15 and can be done at home. The fox isn’t user serviceable at all because of specialist tool requirements and costs nearly as much as a fork to service. In fact, you can almost buy an Ascend for the service cost of a fox transfer. Same with the reverb. Expensive parts, expensive to service.
It’s tube that has to go up and down. It’s not like a fork that has to operate with buttery smoothness and peak performance at all times. As long it goes up and down without hassle and complaint and I can service it easily, or part service it (bush re-lube is super easy too), it’s an area where having the ‘best’ can be compromised on.