after completing a lot of JK runs i've managed to get my hands on a sealed sword.
all my equipment is for JK runs (except kilowatt pulsar) with a nightblade. now im thinking about the future of my first sealed sword. should i make it a faust then continue to JK runs or make it an Avenger and using it as secondary in JK runs for now?
i personally like faust, but already having a nightblade makes me think twice for it.
"DA or GF" is an incredibly frequently asked question. In fact, there is a thread on the front page of this very forum, right now, about it. My general answer can be found in my sword guide.
Your post wasn't clear about what equipment you have, other than (precursors to) Polaris and Acheron. Because you have Acheron, you don't need GF any time soon. So get DA, unless you already have an elemental sword that you didn't mention.