[SmellyGeekBoy]

I'm going to question my sibling commenters' assumptions here - reading between the lines of your comment it seems this may have been developed as part of a work project using your employer's time / equipment? In which case I'd look into the terms of your contract before releasing anything.

Of course if this is a side project on your own time then personal GitHub all the way - your employer doesn't deserve any of the credit at all. I always have a good look at job applicants' GitHub accounts and while contributing to open source isn't a requirement, it certainly helps.