Wiktionary
best off
a. (en-superlativewell off) alt. (en-superlativewell off)
Wikipedia
Best Off
Best Off is a French aircraft manufacturer founded in Toulouse by Philippe Prevot to market his Sky Ranger ultralight.
Usage examples of "best off".
Thinking it over glumly, I decided that poor little Peewee was best off if she had never wakened from that second coma.