Amex Platinum vs Chase Sapphire Reserve
Credits and lounges
The Amex Platinum carries the broadest lounge access (Centurion Lounges, Priority Pass, Delta Sky Club when flying Delta) and a stack of lifestyle credits (the catch is they are split into narrow monthly or category buckets you must remember to use). The Sapphire Reserve has fewer, simpler credits (notably a flexible travel credit) plus growing Sapphire Lounge access.
Points and flexibility
This often decides it. Sapphire Reserve earns Chase Ultimate Rewards, which transfer 1:1 to World of Hyatt and strong airline partners, and its credits are easy to use. The Platinum earns Membership Rewards with deep airline transfer partners for premium cabins. Both are excellent transferable currencies; the question is which partners you will use.
The verdict
Choose the Platinum if you will use its lounges and lifestyle credits and value Centurion access and Delta Sky Club. Choose the Sapphire Reserve if you want simpler credits, the Hyatt transfer sweet spot, and more flexible everyday value. Run the credits you will actually use against each fee with the worth-it breakdowns, and see best premium travel cards.