Brand X is fine – good / reliable post. Not sure who the warranty is with though – I thought they were imported by hotlines which was part of Chiggle.
Oneup v2 is decent if you can find one – although they need a bit more tlc than the Brand X – I reckon the seals are a little smaller height wise to get a bigger drop in a smaller space. Simple to strip and regrease though with basic tools.
I’d defo avoid the reverb.
I think Trans X are ok – I believe they make the brand x branded post among many other rebranded Trans X posts – see Bird etc