The N-Zap '85 was probably my favorite weapon in the first game, but I'm not liking it nearly as much in this one for several reasons. I ran it with Defense Up, which was great for nullifying the TTK advantage some of the other shooters had over it, particularly the Splattershot. With Defense Up gone in Splatoon 2, that lack of extra survivability makes it much harder for the N-Zap to work as well against the other shooters who can take it out so much quicker than it can take out them, even with its high mobility. Ink Armor can help with this, but since it's a special it's not something you can rely on consistently like you could with Defense Up previously.
I also preferred the Splat Bombs on it to the Suction Bombs. This really comes down to personal preference though, Splat Bombs are one of my favorite subs in both games and I typically have much more success with them than Suction Bombs. I haven't played enough of the '85 in this game to really know how well the Suction Bombs actually work with it, but it just makes it less fun for me personally since I loved the Splat Bombs so much.