I just made my own router in the last month for the first time and chose isc-dhcpd. My understanding is it would be more accurate to call the software "finished" - the codebase is very mature and the DHCP protocol isn't exactly a moving target. It does everything I need in a LAN DHCP server, and it integrates very easily with BIND. Given I expect to never need to update this thing besides basic security updates to FreeBSD/pf, is there a strong reason for switching?