Hello:
Two questions and TIA for all who lend a hand!

My daughter will be married later this year at a Marriott.
What is the best strategy for making payment to Marriott?
Should I apply and use a Marriott credit card or should I use my existing credit
card that awards 3.0% back on all purchases?

Second question. They will award either Marriott points or Airline miles based upon the total spent.
Which is the best option ?

MANY THANKS !