What volume and what price are you considering for what device?
We used to support AVRs but it was a third party compiler and we do not support it any more. Not enough address registers for modern jobs.
Both Nuvoton ARMs and RP2040 ARMs are where we are going these days for high volume stuff. If you want really low cost the Sunplus 1T 8051 parts are worth looking at. We have clients who use them.