Upscale wrote:

A dado on a tablesaw is faster, but my preference would be a router
and a
straight edge. Know though, that many plywoods (assuming you're using
plywood) are not exactly 3/4" in thickness.

snip

Basic reason I like to use a 1/2" bit and two (2) straight edges, one
on either side for 3/4" nominal grooves.

Takes a little longer, but NO screw ups and the groove is dead nuts,
although I must admit, the last time I used a dado.

Lew