Apache has shipped with an event-based backend for many years now, so in terms of architecture it's on par with Nginx (while still supporting the classic pre-forking).

Personally I've found apache is more fully featured for niche use cases. For example you can do client cert authentication, then further look up a username from the certificate in ldap for authorisation - all from your apache configuration. For Nginx many of these niche use cases seem to be gated behind Nginx Plus.