Hrm, he doesn't look like my old boy Tyson, who was a combtail for definite.
It's so hard to define tail types VT/Comb tail bettas, most likely to be a mutt[in the most positive manner that can be said]. I'd really have to go with a scruffy VT as guppy dude has said, but just not in that dull manner. Very pretty colours he has, the blue is like just an outline on his anal fin!
Then again, looking closer looks like there's a tear in his tail and his anal fin as well, like a chunk missing rather than just ragged edges.