You could 10 people and get 10 different answers to a question like this.It boils down to personal preference and if a scanner is able to demodulate and track the sytem(s) you want to monitor.
What are you trying to monitor? There is a mixed bag of radio systems in Mohave County.If you want to monitor the Open Sky system you can forget it, nothing is available to the hobbyist to monitor these system.If you want to monitor the X2-TDMA systems in use, you need the GRE PSR-800 scanner,it's the only scanner available for these types of systems, no handheld scanner is available for this type of system.