security/sshguard firewall option preferred on NetBSD

[Mayuresh <mayuresh%acm.org@localhost>]

Exactly one of the following firewall options is required:
        sshguard-aix     Select AIX firewall backend for SSHGuard.
        sshguard-hosts   Select host firewall backend for SSHGuard.
        sshguard-ipfilter       Select IPFilter firewall backend for SSHGuard.
        sshguard-ipfw    Select ipfw firewall backend for SSHGuard.
        sshguard-iptables       Select iptables firewall backend for SSHGuard.
        sshguard-null    Select null firewall backend for SSHGuard.
        sshguard-pf      Select PF firewall backend for SSHGuard.

These options are enabled by default:
        sshguard-ipfilter

Seems pkgsrc has made ipfilter a default choice.

Is this a preferred choice on NetBSD? Any specific guidance on pros and
cons of various choices for NetBSD?

Mayuresh