I've had a similar experience to you with Zabbix in the past. We have it bundled with some HPC stuff I support curently, it's ok but I prefer Sentry/TICK/Prometheus shaped things that we also run.

If you're happy with Icinga2, stick with that. I've used that too at a previous gig and found it better that Zabbix, but my personal take on it. YMMV