I've got to say (other than do what you want), it would depend on the experience you are looking for since DMT trips are pretty different from what ayahuasca journeys sound like. If you don't care at all and want to get mileage out of precious crystal perhaps just vaporize it - heed the advice of proper smoking technique though!
If you plan on taking a spiritual journey that may teach you life lessons then invest your effort in a good ayahuasca trip, do enough research to make sure you give your samples the best shot.
Thats my opinion.