The only difference between Brayshaw & Petracca appears to be 5kg.I think Brayshaw gets undersold a lot, especially if what Shifter said recently about him running the 20m in around 2.82 seconds (which is blistering) is anywhere near correct.
He is a terrific size, has what Shifter described as absolutely elite dual-sided kicking and handballing ability, I think has high character and all that sort of stuff and if he is anywhere near as quick as Shifter suggested he is and has the other attributes that Knightmare says he has (like excellent tackling and marking), then that would surely make him pretty much the "complete package", unless I'm missing something. Basically like a significantly taller and quicker version of Sam Mitchell, as far as style comparison goes.
Write-ups suggest Petracca is a better player when forward but can play midfield, although Brayshaw is better through the midfield but can go forward too
Both appear to be apples, so really we're just comparing a Red Delicious to a Pink Lady...