I've used both. However, I used Foundation early on and I heard it's gotten much better.
I used Bootstrap for a few projects and found out it can be a huge pain trying to eliminate all the cruft you don't need. Sure, you can build a custom package, but there's a ton of CSS which I will never have a need for. Also, the signature bootstrap dropdown menu on mobile devices really got to me since you see it EVERYWHERE now.
My solution was to go with Skeleton and a minimal responsive navigation I built from scratch.
I used Bootstrap for a few projects and found out it can be a huge pain trying to eliminate all the cruft you don't need. Sure, you can build a custom package, but there's a ton of CSS which I will never have a need for. Also, the signature bootstrap dropdown menu on mobile devices really got to me since you see it EVERYWHERE now.
My solution was to go with Skeleton and a minimal responsive navigation I built from scratch.