Avid stays in the plant longer and isn't effective against some mites due to them having built an immunity to the abamectin, especially broad / russet mites. I have a big old bottle of Avid I used to use several years ago but have since stopped using after finding it still shows up in testing after 120 days.
The Forbid is a better product IMO, the gold standard for mites currently, still not something I would want residuals of but it doesn't hang around as long. Only use it in veg.