I came to the realization that 2/3 trade better with most 1's and 2's as well as tokens. The 3/2's are more likely to trade up though. The 3/2's also help when dealing with some key cards like Amani Berserker, Succubus, Raging Worgen, and maybe Acolyte of Pain. Which one you emphasize depends on where you want the advantage I guess.
Not sure about the Warsong interaction with the attack damage buffs, since Warsong specifies that it takes effect when you summon a minion. It could even be that it can take effect later on in the turn where you summon a minion and then debuff it to 3 or less attack. Hearthstone card text is not always consistent, so it's a card-specific FAQ thing.