I love chocolate, but I have my doubts that Delta will be serving high-quality European chocolate.
Our Zurich flight had Toblerone, which is mass market, but geographically correct.
We've given Southwest a few tries over the years, but the route map is limited, their IT system is awful and won't let me book what seems like a straightforward Pensacola-San Francisco round trip if a connection time is more than something like 4 hours, and we've hit about 60% delays on our flights because if you're flighting to a lightly-used outstation, their all-737 fleet means that your plane will get poached for the higher value Baltimore-Chicago route if need arises.
I've got a six figure stash of United miles that's nearly impossible to use under the old saver rules because: outstation, and they make redemption on United Express routes so limited, leading a transatlantic trip to price out at non-saver rates for the whole ticket due to that first hop to Houston.
We largely stick with Delta because the airline tries to make a trip reasonably pleasant and lower stress than their peers. The employees are generally polite and friendly even if they're not over the top "fun" like Southwest seems to go for, they hardly ever cancel flights, and their IRROPS recovery work is tops in the industry. There will be problems when you travel; Delta does a good job of empowering and encouraging employees to fix problems beyond the minimum and most of them use that power for good.
And for some reason, my local outstation is some sort of sweet spot for redeeming Delta miles at reasonable rates despite the SkyPeso reputation. (Granted I don't redeem for international business class tickets but if I did, that's what Flying Blue and Virgin Atlantic miles are for)