How does it compare to http://www.litech.org/tayga/

To answer myself: http://www.jool.mx/intro.html points out tayga is stateless. When you don’t have an IPv4 address for every node you want to publish to the IPv4 side, you might be forced to use a “stateful” NAT64 instead: Jool

for starters, Jool is a kernel module and should have way better performance. Also Jool is stateful NAT64, while TAYGA is stateless