First off, I have to say I really love the community going on on this blog and I hope to have some more interaction with y'all!
My two cents on this would be to say it depends on what your goals are. If you just want to look good in a swim suit and have people complimenting that you are slimming down and looking in better shape, swimming will do wonders for you.
Weight lifting in my experience is what is going to make you look big and muscular. Swimming isn't going to get you incredibly muscular. Just look at elite swimmers in the olympics, even they don't look like huge muscly guys/ girls.
But I'll tell you what, if you just want to look good and you don't care about having 12 inch python biceps, swimming can be a great form of exercise to get you comfortable and confident with your shirt off.