I would suggest Gulp myself, but it's hard to keep up with the JS tool
community... They'll probably come up with some other new, hip thing
once you start working on this. ;)
I don't think it matters too much what you pick though, any solution
or framework should be fine in the end.
But I would say Gulp's advantages are:
* Code instead of configuration
* Grunt's configuration can get unwieldy for complex situations
* Process each step with streams
* Grunt requires creating temporary files if you need to chain
several steps together, while Gulp offers streams which are typically
considered more natural
- Ryan