What’s the food like in Delta Premium Select compared with Comfort+?

From what I’ve read, yes, it is a noticeable step up:

• Comfort+ generally keeps the same meal service as Main Cabin, with extras like premium snacks and complimentary drinks on many flights.
• Premium Select usually offers an upgraded meal service and drinks on long-haul routes, plus amenities on many flights.
• Details vary by route and flight length, so check Delta’s page for your exact flight.

If food and service matter on a 6+ hour flight, that is one more reason to consider Premium Select. This Delta Premium Select review has a clear overview.