"What are the best methods to distribute TripleClicks gift cards to attract PRMs and increase sales?"
Both cards are good, the digital and physical Gift cards.
I personally like the Digital Gift cards, you can email them to friends and family.
I like to attach the Gift card picture in the email and explain how the T-Credits work.
For me the cards come faster and I'm building a list of prospects that I'll be able to turn into PSA's.