Smooth on doesn't have the dark glue line, which is really nice for glueing light woods. It's what I use.but with one of the woods a dark wood, the unibond will be good too.
Lots of people use the tb very successfully, and swear by it, and it is a very capable glue- I just prefer the gap filling glues, whilst using some scoring on the mating surfaces.
Just what I like to do.