The brand x one does a job but it doesn’t feel very nice and I snapped one off with my knee a few years back (that smarted) and they get pivot wobble.
For a cheaper end one the ztto one works pretty well – I’ve got 2 Oneup posts and using the ZTTO lever with both for a number of years now. The only trying they could improve on it is the barrel adjuster which feels a bit cheap – but one set you don’t touch it.
I’d probably skip the Oneup one and either get the pnw one with the bit of silicone on the lever for grip or Wolftooth.
Personally ztto does the job and I’m not going to switch as it seems sturdy / is light / has a decent action / makes the post go up and down.
Edit – I had the first gen Bontrager dropper lever and it worked nicely with a brand x post but was horrible with the oneup post – it was like it didn’t have enough leverage so it was really hard to push.