I used to work for Emergency Services in Wicomico County. I repaired and programmed, MTS MCS 1k, 2k, 3k
XTS XTL 1k-5k and
APX 6k, 7x
I can tell you that the APX programming software is far more advanced and user friendly. The previous models all used the same style of programming. If your using the radios for amateur use only, programming wont be too in depth. But if you wanna use them for trunking applications, you will need the system key and the hex ID for the diff. talk groups.
All of those radios are damn fine and VERY robust. I personally would go with the mts series just due to there lower price. Only down side is going to be you have to build a RIB box. And obtaining a copy of the software could be tricky as well.
I see now you want digital, so that leaves you with only APX, XTS, series radios in the MOTO lineup