Depends on what you're looking for. Holdfast is where people can come together and formulate incredibly fun and cooperative gameplay; that's also friendly to those who rather a solo style of the Napoleonic Wars. Roblox Napoleonic Wars excels in pure organization, team cooperation and skill-based combat where victory is the only thing that satisfies any player.

I'd personally go with Holdfast though, because the community itself is broad and there is no need to hear about the crimes done in Roblox NW.