Update:
I have the Chase Sapphire now and use it as my main card. Thanks for the tip on the 60K promo with 5K add a second user. However, for the Hilton spend coming, I just received the Amex Hilton Surpass (60K sign up promo) and signed up to the New Hilton Double Miles Promo. The hope is that my 12X ppd spend through the Amex will translate into 24 ppd going to my United account.