I'm not talking about the best Batsuit in general here, but what's your preference for the suit that Batman should be wearing when he first starts out and/or early in his career (which may overlap with the 'best' suit too!)
Here are some of the suits Batman has canonically worn while starting out, across various continuities and media:
EDIT: I forgot the Earth One OGN in the poll and can't edit it! Do select the Other option and comment if you want to pick that one.
Original 1939 Suit
The actual 'original' suit.
Year One Suit
What an entire generation (or two) of comic readers long regarded as the original suit.
Zero Year Suit
Probably the current 'canonical' original suit.