Hey everyone,
So I'm in the midst of re-evaluating my CC portfolio in order to maximize rewards for air travel and hotels. I typically choose to do business with Marriott and Delta, and would like to maximize my rewards with those two companies.

Currently in my wallet for travel cards are:

Amex Delta Reserve
Chase Sapphire Reserve
USBank Flexperks Travel rewards

The Amex and CSR get the bulk of spending, with dining out/hotels on CSR and flights/everyday spending/bills on Delta. I realize there are better cards for groceries/gas and expenditures of that sort, but I figured that charging everyday items would help me meet the MQM bonus spend faster, and it has.

Is the idea of using these cards for most/all of my purchases the right idea? Or is there some better combo I could be using to achieve the goal of accumulating rewards with Delta/Marriott?

I've also thought about applying for the SPG Amex, but I'm concerned as to what the future will hold for that card with the merger. If it's going to go away in 2018-2019, it might not be viable for a long term earning strategy.

Any input would be greatly appreciated.

Thanks.