I have a 19" Equinox with 140mm Eiffel cranks and a Cyko Lite tire. I guess you would call that a trials unicycle. The techniques I practice on it are varied. I ride it on trails, up and down hills, like a muni rider. I practice wheel walking, backwards figure eights, still stands, pirouettes, like a freestyle rider. I practice various jump mounts. Not sure into what category that fits. I never learned any flatland tricks. I am pretty heavy and would probably break my unicycle (or myself) doing flatland. My riding on this uni doesn’t fall into a particular category.
If anyone more experienced wishes to disagree, please go for it. But I think a trials uni is a more general purpose unicycle and a freestyle is a more specialized unicycle, at least as far as a beginner is concerned. For someone interested in learning the broadest range of techniques, I’d suggest the trials over the freestyle.
The OP already has a 36". If a trials unicycle is terrible at riding distances compared to freestyle unicycle, both those are still terrible compared to the 36".