Re: Bubble Level?
I like the vortex one because it mounts directly to the scope, and if you have to move your scope to to different rifle, it makes mounting it level a lot easier.
I also have a US optics rail mounted bubble level.
I may be the only one to say this, but I think I like my cheaper Vortex one better. Given, my vortex bubble level tube came loose, but I bonded it with better glue and it works great. With the US optics rail mounted bubble level, it flips out on a hinge, and I've found that there is some "give" or movement because of this. It is slight, but with a scope mounted on there isn't any movement.