We started to use Foundation at work but I really like the look of the http://bourbon.io family.
With regards to my Elixir and Phoenix apps I would love to use Elm, but if not I would prefer Foundation over Bootstrap any day of the week.
If I was to do any large projects in Ruby, I would look at Opal tech.
Please blog (or post a thread) about this! I’d be interested in hearing what you think and why the change is more to your liking.