I like how strong both these Pokemon are, but I settled on Emboar in the end.
It's got a good movepool to use in-game, and the B2/W2 Move Tutors expanded it to include some good moves like ThunderPunch and Fire Punch. Sawk on the other hand is more useful in competitive battles thanks to Sturdy allowing it to survive one-hit KOs.
However, I think Emboar's movepool won this one for me. It also hits really hard with Hammer Arm and I was able to take out several opponents with it.