This plus one. But that’s me.

Always go where you feel makes you happiest. You’ll make a **** ton of money if everything works out at UAL / DAL. You’ll make a **** ton of money at (U)LCCs. If the paint on the side of the plane still matters to you then I can’t help you with that. You will grow out of that over time and realize a plane is plane. All that matters; QOL. Paycheck. QOL.

This being said the OP asked UAL vs DAL. Not vs another airline. So in closing my two pennies; it’s a severe gamble. They are both bleeding enormous amounts of money and are not too big to fail (all airlines got loans who wanted them). I have zero doubt to be honest that both will be fine but in what form or shape is hard to predict in this environment.

Both are great companies to work for.

Best of luck and congrats !