I would be cautious with both. The main concerns:
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Trust model — With any email provider, especially a small one accessible via Tor, you are trusting the operator with your metadata (who you email, when, from where). A .onion address does not magically make this trustworthy.
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Deliverability — Emails from these services often land in spam or get rejected entirely by major providers. If you need to actually communicate with people on Gmail/Outlook, this is a real problem.
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Longevity — Small Tor-based email services come and go. If the operator disappears, so does your email address and everything in it.
Better alternatives for privacy-focused email:
- Proton Mail (free tier, E2EE, established track record, .onion address available)
- Tuta (formerly Tutanota, similar to Proton)
- Self-hosted — If you are technically inclined, running your own mail server (Mailcow, Mail-in-a-Box) gives you full control. It is more work but you own everything.
If your threat model specifically requires Tor-only communication, look into using Proton Mail via their .onion address, or use XMPP/Matrix over Tor instead of email entirely.