I guess what they say in real estate about location, location, location is also true for scanners and their P25 performance. Here in Los Angeles area, including Orange County, some Ventura County, and a P25 trunk site at Camp Pendleton in North San Diego County (about 65 miles away), my 436HP and 536HP seem to be the best overall for P25 decoding. The HP-2 does pretty well, but not enough experience with it yet to compare.
Steve AA6IO