Since you mention T20, my advise would be to take AP classes first and do well on AP tests. Once you have exhausted APs for a particular subject, it is fine to take DE courses, ideally at a 4 year college but CC if necessary. So, if your school only goes up to Calc BC, take Calc 3 as DE. But do not take Calc 1 and 2 at CC if your school has the option of Calc BC.
Now if you want to go to a state school with articulation agreement in place with a CC, take as many DE courses as can be transferred. Great way to save money.