networking – Should I run 2 firewalls or manage everything from one?

I currently have a UniFI Firewall in place and I plan to get a OPNsense firewall mainly for a VPN.

Setup:
Modem – OPNsense Firewall – UniFI Firewall – VLANS (Rules made by UniFi)

Are there any advantages of running a setup with 2 firewalls or should I move everything to the new (more powerful) OPNsense firewall?

Thanks!