Yeah I would rather buy BoP, which I am
But Heroes over Europe will be a terrible game in my opinion. I played a bit of the Pacific one, and thought that the limited controls and just the game was boring, really I think those games were made for little children to enjoy.
BoP is a much more mature and accurate game to play if you really like WW2 flight sims and like the big variety of planes and controls. Heros over Europe will never stand up against BoP in sales, and if anything the later release will just make the BoP sales go up because once people buy Heroes over Europe, and realized that it's such a horrible game, they'll take it back and get BoP with their friends.