Which tool chest should I buy?

Yup. Snap on. I bought my at home snap on box at an auction, top and bottom, I think one of the first they put roller slides into, vintage 1987 and paid double what the snap on one that you are considering is going for.
I had to pull the drawers and clean up the ball bearing slides so they slide as expected and clean off a bunch of old paint over spray. But compared to the price of something comparable off the snap on truck today? I felt like I stole it.

I wouldn't give a nickel for a newer Craftsman box. Something they made back when my dad or grand dad were buying tools? Maybe.
That kobalt setup might be worth a deeper look into. See how the metal joints are, what gauge steel they used.