I’ve got both. Foundation 6 is incredibly powerful, BUT with great power comes great complexity. It’s way too much for my 54-yr old brain, and I’ve struggled too. Swatches are a killer feature, but even simple things like positioning content feel way too convoluted to me.
Foundry 2 (and the add on packs) is WAY more accessible to me. It just works.
Case in point - Menus. I tried to replicate a responsive menu in both Foundry & Foundation. Foundry Mega Menu just did everything I needed - top bar on desktop/tablet, and hamburger drop down on mobile - which slid over the top of the page content.
Foundation, I could not get the hamburger to slide over the content, it just pushed it down the page. Swatches are a brilliant idea, no question, but I could not figure out how to make it slide over. Several questions on the F6 forum didn’t get me the answers I needed, so switched back to Foundry.
I LOVE Joe’s work, but it’s written by a (genius) techie for techies. Foundry is for the rest of us. And don’t forget Alloy 3 - I had my blog converted with Droplets and Embeds done for my site in less than 2 hours.
And Adam’s support is second to none - I’m by no means a techie OR a web designer, and he’s always helped resolve any issues I’ve had (99% my fault) without making me feel dumb.
You won’t go wrong with Foundry.
Hope this helps - happy to answer (as best I can) any further queries.
Adam (not THAT one)
EDIT: And the Elixir Graphics YouTube channel has videos explaining pretty much every component stack - well worth a watch to give you a feel of how it all hangs together.