At the moment there seem to be several competing digital modulation schemes First there was ICOM’s D-star system, then C4FM from Yaesu, and of course DMR, which is gaining ground in the commercial PMR world. There are even a few experimenting with TETRA, as used by the public services. Like Betamax and VHS, the best system may not win in the end.
At the moment, I am just not interested. I’ll wait to see who wins in the end. My bet is DMR will win in the end as there will be a plentiful second hand market from PMR. This will never be so with any proprietary system. DMR is an open standard, so there will be plentiful radios around and at decent prices before too long.