Your problem is that you are just going to have to try them and see if you like them.  
I got some cheepo's at Harbor Freight and the straps just didn't work for me.  I got them for doing work around the house and yard.  My last pair came from Ace Hardware, but I haven't used them that much to tell if I really like them or not.  
I wore my knees out climbing poles, and ladders.  Not to mention crawling around in crawl spaces.  Now I think twice before I even get down on my knees.  But for around the house I picked up a couple of knee pads at HF.  But they would be worthless hunting.