A side mount gimbal is cheaper and always places the center of mass at the pivot point vertically (very good), but unless your lens foot is the right height it will place the center of mass off to the side of the tripod (potentially VERY bad).
The best gimbals are "bottom mount" and have full height adjustability. The LensMaster doesn't have height adjustability. The 393 has "some" height adjustability, but it might not be ideal... and I think it's overpriced. Cheaper ones use UHMW bushings, and the best use needle bearings... but I think that's a very minor concern. More important IMO is the smoothness of drag/tension that can be applied.
Some complain that the Beike always has some drag/resistance, but IMO that is a good thing... a gimbal *should* have some drag applied, part of it's job is to eliminate some of the jerkiness at the controlling end (you). I've seen the Beike, but never used one or taken one apart to say exactly how well it's made/works. But if "cheap" is a main concern, I would buy one.
I've used Wimberley, and while very good, they're like everything else w/ photography...exponentially more expensive for small improvements. I also use a Benro GH2 for many years w/o many complaints... but I did have to disassemble it and fine tune the panning drag mechanism to my liking.
Now I don't use gimbals at all... I use UniqBall heads instead. But they are *not* gimbal heads, and they also cost a fair bit.