I believe having a credit card would improve your rating, but I'm not sure by how much. Obviously it's not your only credit, but in a few years if you can show that the account has always been in good standing and paid off in full that will make you look better. People probably have more trouble with credit cards than student loans (since credit cards don't increase the probability of getting a job that pays well) so having one or two and not getting in to trouble would be a good sign.
Aside from that, I put everything I can through my rewards card. It's also nice to have a little time to pay it back interest-free.
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