As someone who has owned both, I will say that both are great choices.
I would lean towards Rottendog for the fact that I can condense to one board, and that the buttons and dipswitch programming are setup exactly the same as originals so that all off the instructions from the original manual and cabinet cards are still applicable. Programming & entering diagnostics on Kohout's boards is done with jumpers.
Kohout's power supply is the best on the market IMO.