lets me spice things up a bit, i remember vaguely, if you could search in this very forum about these 2 lancer's, the creator said FSN lancer has the advantage if its in a certain part of ireland and in higher ground, and otherwise, i remember vaguely, that FZ lancer is a bit stronger. i think stronger was the word use in the post.
again, if u ask me, i just read thru FSN again, i think FSN lancer's speed is of greater asset. 2 lances cant even touch FSN lancer's one and only lance, gae bold. plus, the move where lancer throw the lance like a javelin and it explodes into thousands of thorns, i dont think FZ lancer cant defend that. FZ lancer had to have a technical battle, strike first with his one lance where one hits, you never heal ( same ability that FSN lancer had also with is gae bolg, this one needs one special lance for that, another one for sumthing else i forgot), strike first b4 FSN lancer gets away and gets into position to do maximum damage, which i think, would be very easy. he's the only known lancer with that bestial speed, as the VN put it.