The bow on the 30 isn't lacking for space. We spend about 60-70% surfing and couldn't be happier.
I have 1100's in the rear lockers that work well. Under bench 400's and 750's seem to be not needed once a few people are on board.
That said, The Woons has posted one of the best summaries with photos to back it up on this comparison.
Test them both under the scenarios you'll be using them...go with a 6.0 or higher, if anything for the better fuel mileage and resale.