I don't live in Phoenix but my daughter did (just returned to LA after 5 years there) so I had my 436HP, 536HP, and WS-1080 over there a lot (near 22nd East and Camelback) over a 5-year period. The TRX-1 and 2 were not out then, but the EZ-Scan software is basically the same.
I found the WS-1080 to be a PITA to program multiple sites here in LA as well as on RWC. TOPAZ, and Maricopa Cty TRS in Phoenix. The 436HP/536HP are much easier to program multiple sites with any given trunking system in my opinion with the use of quick keys. Just program each site as a Department QK 91, 92, 93, 94, 95 etc, and very easy to turn on/off mutliple sites, especially on RWC and Maricopa Cty TRS.
I always found the x36HPs to be relatively easy to set up. The decode quality on RWC and TOPAZ was usually excellent. I have had the TRX-1 and TRX-2 now for about 5 weeks. They are good scanners, but greater than the 436 and 536, I don't think so. For weak signal work, the TRX-1 does perform better on some VHF/UHF than the 436HP on a duck antenna. One you go to a better outside antenna, I find any advantages of the TRXs outweighed by the x36HPs because of available 3rd party software, easier replay, more informative display, and the GPS features.
Also, I find the Unidens actually still better on 800 Mhz trunking systems than the TRXs. And in Phoenix, you are talking a lot 800 Mhz trunking with RWC and Maricopa Cty. Just providing another opinion for you Morphine to consider when selecting a scanner.
BTW: Also had my 996P2 scanner out there couple of times with very good results.