My pitch for the Rythm is it is wonderfully versatile. It is a drum machine with a 64 step sequencer, which has pad you can hit to and dynamic velocity, which can be recorded to the sequencer, is can be driven by MIDI most track record independently. can be digital, analog or both. Lush, deep sounds
The Tanzbar has only analogy no pads to hit and not digital integration. it sequencer is only 16 steps. it is knob driven hits, so that has to be your style of play, personally I find it difficult on my dark time. sounds great
The Vermona is also analog only no pads no sequencer. great analogy tool but you need more work and equipment to get a looped beat… Again knob driven. Great sounds, highly designable circuits.
So you want a one stop shop with all the trimmings the AR, if you want something in the middle the Tanzbar, and if you want no digital and to do it yourself sequence must be added, then go with Vermona.
IMHO