I agree w/ replies you have received so far. Generally, I suggest keeping both and using the Marriott card only for Marriott purchases.
I will add that the Chase Sapphire Reserve (CSR) will give you effectively 4.5% return on dining and non-portal travel spend. For example, you earn 3x points on dining but this is redeemable against dining charges at a 1.5x rate (and you still earn the points on the dining charges). Also, I highly recommend coupling the CFR card with a Chase Freedom Unlimited (CFU) card, which earns 1.5x points on everything and has no annual fee. These CFU points are then transferrable instantly to your CFR card and redeemable at the 1.5x rate (effectively a 2.25% return on regular spending). I don't find the Chase travel portal all that useful despite the 5x points rate and instead prefer in most instances to transfer points to Chase partners.
One of the best is Hyatt, which has very reasonable points redemptions as compared to Marriott, Hilton and others. For example, 5K or 8K is often all that is needed to secure a room at many Hyatt hotels. So, you could spend $1,666 on your CFR card to get 5K points, transfer to Hyatt and redeem for a free night. The Bonvoy card (and the Marriott Bonvoy points system) never comes anywhere close to this. On the low side, most Marriott hotels require at least 20-30K of Bonvoy points.
A highly underrated feature of the CSR card is its travel insurance (as someone mentioned above), which even applies on points booked flight as long as the security fee ($5.6 per flight or so) is paid with the CSR card.