Im looking for the best option for an ATC from my CNC lathe, its basically a Myford ml10 with just the tee slot table.

Struggling to find any for sale and seen a few plans with two different designs for the holding mech. Some use a ratchet and pawl rotating in one direction and others have a toothed ring and have to push the plate forward to rotate to the next position.

Which option is best?

Lastly any plans for a suitable one? Cheers