Hi Guroo,
As such there are no specific recommendations, it all depends on your requirements, if you have 4 vacant ports available and do not have any future requirements then you can use individual physical ports, but if you have any issues, then you can easily make 4 sub-interfaces on the ASA physical port, just make sure not to use that physical ports to pass the traffic.
Thanks,
Varun Rao
Security Team,
Cisco TAC
Thanks,
Varun Rao