Missionary vs. Cowgirl?

The guy I'm into is more into me being on top, but I have a hard time getting a good rhythm going, and I really just prefer getting pounded. Is this going to be a problem in the long run? Do you think he'll be fine with me not riding him that often? I'm into trying other stuff; doggy style has worked for me in the past, though it's been a little off for us.
Missionary vs. Cowgirl?
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