Alaska’s first class is...pretty basic. The seating has gotten better since they removed a row and spaced out the rest on the Boeing fleet... but the “soft product” is grim. Small portions of weird catering, limited meal times, no predeparture beverages, etc. I’d encourage you to review the meal service threads in this forum and the AS one to come to your own conclusions, but I have a definite preference for DL catering and onboard service.

DL has in flight entertainment in seat, while AS is mostly reliant on Dig-E-Players or WiFi streaming entertainment. (The AS Airbus fleet does have seatback IFE for now, though.)

AS gets the worst gates in many east coast out stations; BOS is a particular offender. But I think pretty much everything at DCA is fine, so that’s probably not a concern for you. Remember that AS has no lounges of their own in Washington DC, while Delta does... on the other hand, AS offers lounge access in their hubs to paid F passengers, while on DL you’d be reliant on a credit card or membership for entry. (But you say you have one.)

AS also recently implemented draconian carryon bag size checks, which have resulted in lots of people getting surprised by a requirement to gate check their bag. Recent reports say they backed down after overwhelming negative feedback, but it’s another factor to consider.

If the AS flight times work well for you, they aren’t a *bad* airline by any means. I can and do book AS directs over DL connections when it makes sense. But they have really lost their way lately with the VX merger and are a shadow of their former glory, and I’m letting my MVPG status lapse after this year to return full time to Delta flying.