2012 GMC Sierra 32000 miles: replace torque converter or whole transmission?

Bought this truck in the last couple months then noticed that it has some vibration going from 45-50mph nearly all the time and sometimes at other speeds occasionally. Took it in to shop to get it checked out and also to replace pulleys/belts. They said torque converter clutch was the issue. Decided to just flush transmission fluid and use an additive to maybe fix it.

Now one month later the check engine light is on with torque converter code. Took it to a transmission shop, they said options are replace just the torque converter since it’s low miles but also 50% chance it would still suck so maybe do the full transmission replacement.

And/or can I just drive it until the transmission completely breaks or is it wiser to do it now?

Thoughts? Thank you.