I picked Tom.
But this was a tough call. I kind of think Tuvok is the more enjoyable character for me, but only when he's really allowed to shine, and that's not very often. When Tuvok takes center stage Tom can't match him, even if Tom is in a central character roll, but when they're both kind of not central, which was more often than not, Tom came off as more enjoyable. That's why I picked him.