I agree, i'd go for the group enviroment. Those group classes can be hard impact though, so if that's even a concern i'd say the pool. Although they should get pool group activities because there's a lot of good stuff you can do in a pool besides swim. "deep water jogging" for example is good at getting the heart rate up and is really low impact and still allows you to get a great cardio workout. Swimming i really only care to do if i'm training to swim (which I do want to eventually get into triatholons), and I like cardio classes. So again, the group enviroment is fun, you get to meet people, great motivation and is good for getting fit.
And one can't really say which would be better for you because we have no idea what these group classes are. It really comes down to how high it gets your heart rate up and what kind of muscle involvement is in there (if you're looking to better muscle performance). And when it comes to swimming, unless you have some equipment (fins are great for building legs) and know how to swim in the different techniques, it's really gonna be hard to get a great workout from it. But swimming is a great workout! I still swim just to relax for the most part (as i'm not taking the swimming class anymore).
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