What ever the engine likes for the parameters of the build and/or for the duty it is to be performed in.
Im sure that really didn’t help you in a decision to your specific (and possibly future or current) combo in the search for what your looking for. Honestly, you will need to experiment. Open and four whole spaces are cheap. Supersuckers get pricey. If you know someone who will let you borrow one, go and get it and give it a whirl.
