who doesn't like that

the question is, as always, about flight pattern and what makes sense to you...

JetBlue has a great inflight product, perky crews, swanky terminal, and snacks
Delta has a global network, a ton of alternatives in case of irop, and frequency. And a premium cabin if that's of interest... (save for B6 Mint on the transcons, this is a unique feature)

great points made above - airports in NYC also: choice of 2 hubs vs one