I think more info would be beneficial if we knew the make up of your group.
As other have stated, the pool at the Beach Club is much better but Boardwalk is fine as long as you don't have a clown fear
I've stayed at both and since it's just my husband and I with no kids, I'd go with the Boardwalk before the Beach Club. When we stayed at the Beach Club, our room was on a hallway that led to the stairs to the lobby and we were awoken each morning with lots of families on their way out so that was not a good thing for us. Also, at the Beach Club, there are smaller balconies and we requested a full balcony and got one so that was good.
At the Boardwalk, I requested a water view and we were put alllllllllllllll the way down the hall with a view of the canal and that was fine as we just used the stairs to get to where we were going and we only had neighbors on the one side of the room (we were right next to the stairs allllllllllllll the way down the hall). The second time we stayed there, with my in-laws, we had a one bedroom place right above where the now
DVC selling place now is. The request was just for an Epcot view (my mother-in-law's request) and it was a great room but not something everyone is going to be able to enjoy.
We are not huge pool people and don't mind walking a bit to our room so that's why Boardwalk wins for me over the Beach Club. But, if I had to stay at the Beach Club, I'd be fine with that too.