Well, if I didn't have access to either, I'd go with squaring up the face via hand plane...squaring an edge, probably use router table & a straight bit or, flush cutting bit & a straight edge guide 'if' the the piece were say 3/4" or so. thicker would lead me back to the hand plane.
One time, years ago on a job-site, in a pinch, we over-lapped 2 pieces, used another for a guide and ripped thru both at once with a circular saw. It accomplished what we needed, but wasn't what one could call fine furniture quality.
Sure those more experienced than I can offer more in-depth replies.