The short rant:
- You don't need to ask which distro, ask which mint version
- The answer to #1 is MATE or xfce.
The longer rant:
I've been using xubuntu a bit, for guest OS in desktop VM, but I don't really know if I like it enough to recommend it. It's less rough than Arch, but so is 24 grit sandpaper.
Like others have said, there are many contenders for your use case, but mint stands out. I'm probably gonna go with mint once windows 10 stops getting updates. Mint or parrot. But TBH I don't want to daily drive parrot either.
Which version of mint then? That's really the question to ask. And if you ask me then I don't care for all the bells and whistles, I don't need animations or semi transparent windows. And when Ubuntu went with unity back in the day I walked. So I guess I want my GUI to stay the same. So I'd go with MATE or xfce.