We like the SL because on the DLQ the bedroom is not accessible with the bedroom slide closed. We do a lot of quick overnights at Walmart etc with the slides closed. Also, SL has separate vanities. We think we would be on top of each other too much with the dual vanity in the DLQ.
As for 44 vs 42 (or more correctly, 45 Vs 43) The bigger coach has substantially more basement storage. I don't think the extra 2 feet would have any appreciable effect on gas mileage or handling, but it could be a limitation in fitting into a campground occasionally. Worth the tradeoff, in my opinion, but that is a very personal decision.
Marc and Jill, Wellington FL
2013 Entegra Anthem 44SL