Spira prima(because high crit chance) > Despair/hikou prime for serious business. Spira prime can achieve a pretty 40K dps, most weapons that go beyond that sacrifice ammo efficiency, sustain(through reloads or delays) and/or range while spira prime is very ammo efficient and pretty easy to handle even from high range if you aim properly.
Mara detron can achieve pretty high dps and has good spread: lot of confort
Akmagnus is an extremly well rounded weapon and can deal with any kind of content atm
Castanas series is somehow ok in camping scenarios but are below what you can get for that niche on primaries (because of Tonkor, Torid, ...)
Atomos is kind of an Ignis sidearm, it will wreck lower content
Synoid gamacor can handle itself pretty well against corpus in midlevel missions where you can alternate between hiting and using skills
Sonicor is a goto weapon for a lot of players for good reasons.