All modern chairs are made from a pool of common suppliers of motors, controllers, wiring looms, bearings, tyres, actuators, etc. So reliability is pretty much the same across brands.
So the real question is how easy is it to fix, program, and obtain parts easily and if you want to be tied to a specific manufacturer such as permobil who use many of their own custom "common" parts that locks you into their ecosystem. Who are particularly problematic unless you rely on them to fix every tiny thing.
Sunrise are pretty much the same reliability but easy to program or fix or get parts or DIY. With the exception of problematic suspension units on that particular chair you are looking at... Bad luck! According to a good tech on here. And trust me there are not many of those. All my chairs are sunrise, rear drive chairs and lightly modified to make them work a hell of a lot better. One being the same Q700 but the R rear drive version which may soon be available in the US. Read and scroll, because the DETAILS are
everything here.
https://www.wheelchairdriver.com/board/ ... 33#p171026Thats my opinion, many may disagree. Take a look at the V6 chairs now also sunrise medical.