In my experience there is not a lot of functional difference between the cheap or the expensive Kreepy Krauly clones, I owned several suction side cleaners over the years starting with the original Kreepy Krauly, before switching to a robot cleaner last year. Here are my observations:
Any design can get stuck in a given pool, it is just a matter of luck when it comes to step/ladder placement, etc. I have owned $69 China clones that would not hang up and $300 name brand ones that did hang up.
The more expensive ones tend to be built better, the $69 clone I mentioned above started falling apart within a couple of months, but I was able to patch it back together for a year or so (first thing to break was the snap together floppy weight, a screw and a nut put it back together, etc)
Some have silent flappers, others go clack clack clack like the orignal Kreepy Krauly, this is only a concern if your around the pool while it is running, or if the pool is right outside a bedroom window, etc. Also the more expensive ones tend to have better accessories like adjustable flow bypass, etc.