With players who make millions of $$s and an 82 game schedule to navigate, believe revenge is a small factor in most cases. However, in isolated cases could certainly become a bigger factor such as games that include a fight, last second decisions, recent playoff foes, geographical forces (Clips/Lakers). It would be logical to assume that the recency of last meeting would enhance the revenge factor.
I lean to Boston tonight, but more for their anti-streak nature (have not won or lost more than 3 consecutive all season, tonight will be 4 losses if they fall) then for their last encounter with the Hawks. I will not have a play on the game however.