Wiktionary
n. (context idiomatic English) The best proposal or plan.
Wikipedia
Best Bet is a 2007 Hong Kong comedy television series produced by TVB and starring Michael Tse, Linda Chung, Wayne Lai and Anne Heung. The series was Tse's first leading television role and aired from 12 February to 9 March 2007 on TVB's operated channel, Jade.
Usage examples of "best bet".
I guess Radio Paris is the best bet, if they are still trying for us.
Her's your best bet -- stacked full of curios but she'll have 'ee if ye relax a mite.
The clerk explained that Pittsfield was my best bet for selection, but there was a local antiquarian shop about ten miles down Route 4.
Today they were going to search the reef again since it seemed to be the best bet.
Projectiles are our best bet in a world like this: bows, slings, spears.
So, if you itch to discover a new species, a new kind of beetle is your best bet.