When comparing Brainfuck vs DASH, the Slant community recommends DASH for most people. In the question“What is the best programming language to learn first?” DASH is ranked 52nd while Brainfuck is ranked 76th. The most important reason people chose DASH is:
Dash has a very fast startup, this happens because the shell is started a lot of times during boot and dash minimizes the work it does during this process.
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Pros
Pro Great exercice for your brain
If you ever succeed to use it at least once, whatever it does, you will never be afraid to learn any other programming language.
Pro Very good introduction in geek communities
Say you made a Brainfuck program once, and count how many geeks you will attract.

Pro Designed to challenge and amuse programmers
Rather than have a practical application, Brainfuck is an esoteric language for the purpose of challenging programmers who want to code in a more unusual language.
Pro Fast startup
Dash has a very fast startup, this happens because the shell is started a lot of times during boot and dash minimizes the work it does during this process.
Pro Low memory usage, which matters a lot in embedded
It is designed to be very lightweight and has no support for shell specific extensions that are not POSIX.
Pro Default shell on Debian systems
DASH is the default shell for Debian based systems due to it speed, full POSIX compliance and low overhead.
Pro Full POSIX support
It's fully POSIX compatible, so if your script runs on dash it will probably run on all other shells.
Pro A perfect clone
It's a clone of the original System V4 Bourne shell.
Cons
Con Esoteric language
Brainfuck is by design extremely difficult to use. This makes it un-learnable to beginners.
Con Impractical language, used only as a toy
It won't get you a job. It is not used in any practical application.
Con It's a joke language
Con Almost as bad as Python, but less adopted.
It's a joke, just like Python, but at least brainfuck admits it ;-)
Con R-rated name
It's difficult to talk about in polite company.
Con Doesn't support all bash features
Dash does not support all bash features, sometimes called 'bashisms' unless explicitly pointed at /bin/sh
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