Surprised this hasn’t been mentioned yet but a major advantage (to me, at least) that the DT has over the OT for MIDI sequencing is that it can handle overlapping MIDI notes, meaning you can hold a chord and have other notes play over it. On the OT, any MIDI event would cut off the previous/current event, meaning that a chord would be cut off by any notes that came after it was started.
I had basically written off Elektron sequencers for MIDI after having an OT because it was such a bummer to work with, so I was pleasantly surprised by the DT (and DN) when I discovered it could handle overlapping notes.