If you dislike group work, I'd recommend against health sciences. Do some reading on what problem-based learning (PBL) is, and then ask yourself if you want most of your courses to be taught like that.
I wasn't in health sciences, nor did I apply, because one of my high school teachers explained the group work aspect as "the group work I make you guys do that you all hate". After coming to Mac and actually seeing what it's like, I don't regret that decision for a second - I would have hated to be in health sciences. As for what people do after health sci, I believe they publish an annual pie chart on their website of where the graduating class each year is going. Most of them go to med school - but just because you're in health sciences, that does not guarantee you admission. Every year there are health scis who don't get in to med school (though they are vastly outnumbered by the people who do get in
)
Artsci is pretty cool. You can combine your degree with any one of a number of specializations, or choose to keep it general. They're a pretty tight-knit community, and it's a fairly unique program. If you have a wide range of interests spanning many faculties, or you aren't sure what exactly you want to do with your life, it's a good option. People have gone to grad school (in many different grad programs), as well as various professional schools from artsci.
In both cases you have the freedom to specialize or stay general, and your degree is really what you make of it.