nvm... should have read the topic title completely
The usual "veto maps towards faction" is absolutely okay, meaning you veto accordingly to agression and mobility of the faction you play.
But my prefered approach is "veto accordingly to playstyle". You can mimic certain playstyles with all factions, which results in a comfortzone in possible engagements, and a more chill gameplay experience - still, factions are different, so adjustments have to be made.
As SOV just veto the maps you personally dislike, and keep a healthy commander loadout - meaning you should have commanders with different options equipped. IMO they can currently cope best with different scenarios.
Current vetos for me:
Vaux Farmlands
Lierneux
Moscow Winter
Moscow Summer - except with USF, then i veto Voda
If certain enemy units cause too much hassle for you, you might wanna veto maps they work well on.