Wilson Audio old sound vs new sound


Does anybody can tell me what are the main difference between Watt 7 (WA old sound) and Sophia 3 (WA new sound)?

Also, many people said Watt 7 produce more bass than Sophia 3 because it has 2 x 8" bass. If your listening room is not big enough, better to choose Sophia 3. Is it correct?

THX!
mmbl622