I have a United credit card and I also get regular United miles. The credit card miles just go on my regular frequent flyer account, so there's never any problem redeeming anything. My BF flies a lot for work, so we have actually had a fair number of *free* trips. I've taken trips with both United and Delta miles.
When redeeming miles, you do need to purchase far in advance, especially for peak times. For example, right now, on November 13, if I wanted to get tickets around Christmas, my choices would be limited. If I wanted to get tickets for Thanksgiving, I'd be SOL.
Another thing to consider is partner airlines. For example, United is part of Star Alliance, so you can redeem (and generate) miles on flights with other SA airlines. Delta has something similar.
I don't have a Delta credit card, but I suspect that it would work the same as United, purchase miles are the same as flying miles.



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