I selected P25 Phase 1. It works, it's effective, a majority of the noise issues have been worked out, it's available for trunking and conventional, and when people stick to the standard and not implement proprietary embellishments, it fosters open, competitive procurement.
The drawback is that for one reason or another (we'll probably never know the straight story - my bet's on marketing more than anything else), the equipment is substantially more costly than other similar items.
I would have selected DMR, but its marketing here in the US was not intended to be for public safety. It also works, it's effective, and so forth. Unfortunately, when implemented on VHF, it is not friendly to incumbent licensees as transmitters stay up for prolonged periods of time, and this tends to limit incumbent system effectiveness (everyone's output is someone else's input or simplex channel).
In the same line of thinking, you may have wanted to include TETRA. It's 4/TDMA and is proven to work elsewhere in the world, even in public safety applications.
And, LTE as an RF transport medium. It's coming.