Ask HN: Which Email Client Do You Use for Gmail?

I find the web interface to be fairly clunky now, and I really liked where Sparrow on OSX was going. Sadly, it's no longer being developed and the replacements I've tried, such as Airmail and Apple's own Mail client, just don't have the fluency I'd like.

What are the popular HN choices - on both desktop and mobile - for accessing your Gmail?