Shockwave style swordsmanship or in general can take DC feats but cutting will always reign over from damage standpoint, a Tougen Shirataki would've done way more damage than Roger's attack did on Garp + a scar for lifetime.
Cutting attacks will simply look more devastating because you can see more blood and visible damage. That doesn’t mean that it’s stronger; Shockwaves can end fights faster with its knockout power… plus, it will win in clashes.
Xebec also clapped an admiral so hard that they can’t save them with the immediate attention of the finest doctors in the world lol. You know you’ve been hit hard when Oda adds that line in. Folks rarely even die in One Piece fights. Shockwave is supreme, there‘s a reason why all of the legends use it.