So far as I can tell they are all very similar.
While each jig will have its own special touches they work on the same principal and are relatively idiot proof.
That being said, I do not like the Bitzenberger because the nock receiver does not accept the Bohning classic nocks I use, it has to be filed or drilled out. That's a little touch rarely spoken of by the jig's fans. Not a big deal, but kind of odd that it won't work off the shelf with one of the most popular nocks we use.
I like the Vador uni-fletcher. It's easy to adjust without tools, is inexpensive, and works fine for me. A friend of mine has some but would rather use his Jo-Jan multi-fletcher.
A lot depends upon what you get used to.
Remember, no one is going to be able to look at your arrows and say, "Those were fletched with XXX jig."
Once they're fletched they'll all look the same and perform the same.
Guy