ABC/AAC or even ABN is better than ringed. Better power, better fuel economy, longer lifespan, and should vibrate less, since the piston should be lighter, all else being equal.
![226 @@^](https://stunthanger.com/smf/Smileys/classic/icon_226.gif)
Steve
PS: You have too many engines already. Learn a few really well, and you'll be a happier camper.