RadioLib release notes are the source of truth - the LW is considered stable - no substantive changes in months and is able to pass all LW related compliance tests.
There is a place for both library’s, it’s not a competition - neither are commercial.
If you need to fit on a smaller AVR based device, then LMIC is the way to go. LMIC-node provides a great wrapper that gets things going with ESP32 but no persistence so deep sleep becomes ‘interesting’.
RL supports v1.1 which is a little bit academic for most developers. And consequently has explicit support for persistence. For ESP32 there are worked examples to cope with the way that deep sleep works on that MCU. So as you are using a TTGO LoRa32 V1, I’d use RL.
If you want to learn LW well, then implementing both libraries on a few devices will help surface some important details of LW, which, like Shrek, has many layers. Then if you really want to get in to the weeds, use LoRaMac-node on STM32.
Please note, for any particular support issues other than general discussion like this, please use the RadioLib repro.
