Calculus-based statistics is generally a more advanced and rigorous introductory statistics course than the non-calculus-based statistics that AP statistics is modeled on. I.e. it should cover the same basic topics, but is free to used calculus in explaining things. If you know calculus, the calculus-based course may be more interesting to you anyway.
You should be able to do well on the AP statistics exam after taking calculus-based statistics.