As I understand it, connections through a DMR repeater are time division mutiplexed meaning that two QSOs (or even Nets) can take place over the same repeater at the same time, with one group not even knowing that the other group is there.
There are also two types of DMR repeaters (excuse me if I get the names wrong, this was just from listening to a podcast last week)
C-Node DMR where the talkgroups (think of them like voicemail virtual conference rooms) that users of the repeater can connect to are controlled by the repeater keeper - so if the room you want to go to isn’t on the list you have to contact the repeater keeper to add it.
Brandmeister DMR where the users decide what they connect to (and leave the repeater connected to). A certain amount of anarchy there with the freedom of connectivity.
All DMR handhelds will work with either repeater standard but to get to that second channel you need to have a tier II capable HT. Of course if you run your own personal “hotspot” into the DMR network over the Internet, you’re going to be the only person using it, so then the $50-$60 Tier 1 UHF only, limited number of channels DMR HT will be fine.
It looks like the “Known names” are TyT, Tytera, Hytera and of course Motorola. Quality and price in that sequence of course as each manufacturer brings out a new model, which is best varies.
Baofeng is the manufacturer who brought out the cheap DMR (Tier 1 only HT) but they are now working with Radiodity on Tier 2 HTs as well.
It’s probably best to ask around, what others in the area, using your loacl DMR repeater are using and go with that as then they can send you a “code-plug” - which is nothing more than a pre-written configuration file for all the local repeater channels and talk rooms, that you load into the HT via a USB port.