Might be just me but I've always thought the Vickers had the best accuracy of all MGs. Its gotten even better with the new "Take Aim" ability.
I feel like I win most of my MG vs MG duels with the Vickers. It wins more than it loses.
I'd say this is my experience as well. By feel Vickers seems to be better at DPS (not accounting for Vet 1 abilities). Suppression wise I'd say almost everyone would agree that MG42 is better in that regard. Personally I think suppression counts for more in most game circumstances but seeing a Vickers kill a retreating squad is very satisfying haha
Back to the OP topic. Ostwind doesn't need suppression as it's pretty lethal as is. I had no clue that Centaurs Strafe ability had suppression because it usually either whiffs or deletes whatever squad that other player usually forgot about. Even then it's not like the Stafe ability gets much use from my experience since Centaur usually gets relegated to AA role if it gets built at all... Either way the comparison to Centaur is no real justification for Ostwind suppression.