Polonium K or YHM Fat Cat suppressor

I'm in the process of building my first night gun. I've got a AR in .556 with an AGM TS35 384 and I'm looking for a suppressor. I've narrowed it down to the Polonium K or the YHM Fat Cat. I know the Polonium K is on backorder at Silencer Shop, but i talked to them this morning and they said they usually fill them in 1 - 6 weeks, which is no problem for me. Any recommendations and/or advice is greatly appreciated! Thanks guys!