I’m currently considering a build and am curious about the same choices.
I’m not a chassis shooter nor do I shoot PRS but what the heck, here’s 2 cents worth based on my considerations. Do standard stocks fit you well? Since you will be using different shooting position will a standard stock be the best compromise? The nice thing about the chassis is the ability to change grips, buttstock shape and length of pull. Is weight a consideration?
Please let us know what you decide.