I'm going to be purchasing a Sage Launch 8' 4wt soon and am considering a WF-4-F line for it to cast #12 to #8 flies for brim and small bass.

I've used SA Headstart on 5wt rods in the past but never the SA GPX. Would it be worth trying GPX or just stick to SA Headstart in the WF4F?

Thanks for the advice.