Where would I find good pvp battlegroup info?

[Ceravan]

Me and a friend are tryin to pick out a decent realm to level a pair of new horde pvp toons, but not a pvp server itself. My question is, where would I find a battlegroup that seem to have the better horde pvpers and such, where horde win bg's more often than not. The current battlegroup we're in, alliance wins more often than not, in most brackets. If anything, a place where I could research that info would be useful.

Thanks in advance

[GormanGhaste]

In the US realms, battle-groups are now only used for arena. Battlegrounds are now region-wide, like the dungeon finder.