Bitz is kind of hard to beat. I bought the Zenith Kit just in case I latch onto a Bitz.
I've had several Bitz jigs, but sold them because I didn't where they did any better fletching than what I already have - 40+ year old Multi Jo-Jan (does 6 at a time - I've got 4 of them and 40+ year old stand alone Martin (high impact plastic).
Don't buy into the "built like a tank." Long as you don't use the plastic or light weight aluminum jigs to drive nails or breakup concrete they last forever.
There's been a lot of talk about the OMP, but they seemed to back ordered everywhere.
For the price, $100.00, the Avalon Hexagon does 6 at time, only straightclamp available - so right or left offset - not helical.
The VMP. Do you really want to spend $350.00 for a fletching jig that doesn't do any better than a less expensive one? It does one arrow, one vane at a time - 3 or 4 fletch.
A lot of tower type fletching jigs to look over - they all do 3 vanes at once. With quick setting glue you can do a lot of arrows quick.
Fact is, 99.9% of the time most all fletching problems are due to the operator........