a lazer range finder will always be pretty much spot on in terms of measuring distance - if there was a diff if more than say 2m between finder A or Finder B - one of them will be faulty/incorrectly calibrated.
The difference in brands and models is the zoom factor of the lens, beam reflection sensor sensitivity (eg in fog or hazy conditions) and the software to assist with seeking (eg pin lock). With steady hands and patience you will get the same result regardless of which you use, the more expensive ones will make getting the correct distance quicker and easier.
Oh and you will need to see what you want to measure distance to - dont hit it in the trees or play any doglegs or undulating terrain or.... you get the point
anyway I have a Golf buddy for sale if you are still interested in getting one
You might feel like your swing looks like an elegant swan floating on a calm lake with the sun glistening down and creating beautiful light reflections on the water,
But it more than likely looks like a drowning elephant.