Best Credit Cards for Landlords Collecting Points

[Justin R.]

I currently use the Amex Platinum Business which is great for travel (Free lounge use, 5x travel rewards, etc) but mediocre with other purchases (1x point per dollar, 1.5X with purchases over 5k). I travel a lot because most of my investing is out of state, but I feel like I loose out on points with other major purchases.

What credit card do you use and what are the most important perks in your opinion?