I have AVW, Belanger, Sonny's and Sherman stuff. Over time like most AVW has made improvements as field operations revealed issues. IMO, AVW mitters are simplest to maintain. Wraps are simple designs, similar to Sonny's. Sonny's top shock makes it more likely to climb a car if there is an issue. Conveyors are simple to work on as well but I spec steel hinge on exit
door. Seems to hold up better with less issues.
Sonny's had top notch service when I made a post with a question about their equipment. They saw the post ans had someone call me and on one occasion fabd a part and only charged me shipping.