You definitely think offense first with these two teams. Early activity in the marketplace has pushed this total up. I see value in going Under.
Chicago needs this game. So the Sky shouldn't lack motivation, nor lack defensive intensity. 
Connecticut just needs to win. The Sun are not going to push pace if they are holding a late lead as expected. The Sun have given up an average of 75.3 points in their last three games. The Under is 14.6 the past 20 times the Sun has played on one day's rest.