I think v1 adds more places for coral. The v2 version might be to close to the waterline to place corals on the right side. The v3 looks appealing but limits the coral placement on that side I would think. To much vertical area.
I could be mistaken but thats how I perceive the pictures.
V3 has my vote. I love the pointed tip on the right structure. It’s close to the water line but that’s ok if you don’t want to place corals on the tip. It looks cool enough without coral anyway!
V3 looks good as is. And I am more of a acro guy and see plenty of acro placement spots in V3 and again I repeat same ...whatever makes you happy is the best option