What's everybody else's go to fusion rifle and why? I really am curious how the different types fit into different play styles, or if there's one out there I haven't seen yet that would be good for mine.

Praetorian Foil with "Send it" is probably the best fusion rifle in the game in terms of pure stats, though I never use it.

Final Rest 2 is still my favorite. Range, charge time, and ammo count are all excellent, and it has nearly zero recoil, so I've outwit people at range with it.

Light of the Abyss is one of the easiest top-tier Fusion rifles to obtain, and it has some pretty great stats.

Same goes for the Plug One, it seems, though I've never used one myself, so I couldn't say.

I have a Calming with enhanced battery that works well, but Light of the Abyss really rips things up and seems to have better impact.

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What's everybody else's go to fusion rifle and why? I really am curious how the different types fit into different play styles, or if there's one out there I haven't seen yet that would be good for mine.

I never spent much time in Crucible, but when I did my weapon of choice was LIGHT/Beware, for the same reasons. The range and stability were extremely high (and the Vanguard vendor's version had rangefinder), and consequently it was capable of one-shot kills from MUCH further away than most other fusion rifles, just because you could actually land most of the burst on target.

I'm with Korny on the Final Rest II; mine has the same perks as your purifier but with accelerated coils, flared magwell, and send it, and I generally find that it's a good multitool for any situation.

If you can roll a Perun's fire with Red Dot ORS1, Hip Fire, and Hammer Forged or Perfect Balance, that's the best legendary FR for crucible. It's charge time is already ludicrous, and with the range perks, you've basically got a legendary Plan C.

But if you're playing crucible with an FR I'd say just use Plan C or PI as a primary.