I was facing the same dilemma in January, I settled on Infomaniak and I've been quite happy so far. They support DKIM/DMARC, catchall, domain aliases and are reasonably priced (18EUR yearly for 5 addresses). They have their own webmail that I find really pleasant to use. Unfortunately no mobile application for the moment, but it should be coming this year.
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I was facing the same dilemma in January, I settled on Infomaniak and I've been quite happy so far. They support DKIM/DMARC, catchall, domain aliases and are reasonably priced (18EUR yearly for 5 addresses). They have their own webmail that I find really pleasant to use. Unfortunately no mobile application for the moment, but it should be coming this year.
I listed the main providers I could find here, in case you are interested: https://adrien.poupa.net/migrating-away-from-g-suite-legacy-...