Startmail vs Protonmail + Simplelogin

It boils down to the email alias. While Startmail costs $5 per month, and Protonmail Pro + Simplelogin Premium costs $7.99 per month, I'm not certain on the quality of startmail's email alias service. Help is welcome, especially by users of any of these services. I also don't care about proton's extra features much.

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