As the author of SpaceVim, I want to say spacemacs is a awesome project, the idea of spacemacs is nice. but evil is not really vim.

I do not use emacs, my first editor is vim, now I am using neovim.

Yeah, SpaceVim has lang#ruby layer, here is a guide: Use vim as a Ruby IDE. I do not use Janus, but I think it should works well, as the developers of that project also use ruby.

The full-GUI vim?

I am using gvim and neovim-qt.

If you are looking for another gui vim, maybe you can have a try with:

1. fvim: https://github.com/yatli/fvim
2. goneovim: https://github.com/akiyosi/goneovim

When I was on Linux os, I use i3-wm with termite.