In my Chase account when I go to the top where the notification flags are and search the menu there, click credit cards and then see advertisements for Marriot, Southwest and United.
Under Marriot and Southwest it says "learn more" but under United it says "see your offer". Is there any significance to "see your offer" instead of "learn more"?
Nope. It's just different ways to target a variety of offers, such as elevated points or referrals, for example.
Unless you see any pre-approved indicators such as the notable green stars/black star offers, then they're just run-of-the-mill offers to apply.