I use G Suite for one domain (because I was grandfathered into a free plan) and Zoho for others. IMAP is a little faster in Zoho, and I haven't seen a differenc

I use G Suite for one domain (because I was grandfathered into a free plan) and Zoho for others. IMAP is a little faster in Zoho, and I haven't seen a difference in reliability. The Google web interface is much better, though.