Tuta.com is similar to Proton Mail + Calendar.
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Location: Germany
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Governance: Private GmbH (German corporation, similar to an American LLC)
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Integrity/trustworthiness/transparency: Better than Proton IMHO. All their apps are open source and available on F-Droid. They encrypt email headers (unlike Proton, who are weaselly about this in their marketing materials).
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User Experience: Ehhhh...6? I'm not in the best position to compare because I do not have a premium plan, so I am not able to examine features like inbox rules/filters. Much like Proton, it doesn't support full-text email search unless you have it cache your entire mailbox locally (either via the web site or app). They do not support POP or IMAP, but do offer their own desktop and mobile apps.
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Pricing: β¬3/month for 20GB, β¬8/month for 500GB. https://tuta.com/pricing