Omniscient.
I did originally start out doing it in present tense--something I'd never done before--but I was slipping into past too much, so I just switched.
And why do you feel it suits your style/voice best? Are certain aspects of writing easier with one POV or tense over another?
Well, I've always written in third, but with this particular story, I was struggling a lot. I was on the fence about the viewpoint and just wasn't warm and fuzzy about third. First is how many of the books in the genre are done, but I wasn't quite warming to first either. I took a workshop on viewpoint where I had to do a scene from the story in all the viewpoints (first, second, third, active voice, omni camera, omni close third, plus some variations from different character's perspectives). At the time we did the omni exercise, I tried it on a scene I just happened to reach--and the scene worked a whole lot better. In first, the scene was way too one-sided in favor of the main character when it needed more balance, and omni gave a lot of balance to it.
That made me think about what the benefits of omni would be, and I realized how many advantages it had for me in writing the story. It is more distancing, which I actually need for some of the confrontations between the characters. It also gives me an opportunity to show both sides of the argument, so to speak, between the two characters, rather than it being one-sided in favor of the main character. But I also have an extremely complex storyline where if I was in first or third, I'd have to do major info dumps because of the main character's backstory, but in omni, I only need to hint at it. Fight scenes work much better for me, too, because I tend to deal with multiple main characters. Fight scenes work well in first and third when there's a hero and a bunch of bad guys and maybe some victims on the side. But add in more main characters, and it starts to become difficult to show what's happening without either changing scenes for the viewpoint or slipping out of the viewpoiint.
One interesting benefit: I've always written short. I was a short story writer, and it still makes me run short. Omni has been forcing me to write longer.