I used Phasers for most of leveling up my Scientist, switched to Tetryon at Tier 4 and been using them for PVE since. Their ability to knock down shields is straight evil when combined with Tachyon Beam, Energy Siphon and Subsystem Targeting. Take those shields down and keep them down...
Which energy type do you prefer.
I enjoy the oddly shaped Elachi disruptors.
I really am a traditionalist. I like phasers. And also like the blue phasers that came with the TOS Connie. And also dig the Andorian phasers you can get from the store after you get the Kumari.
Yeah, I'm a sucker for phasers.
It's just one of those things that makes my Star Trek game feel a tinsy bit more Star Trek. That's all it is. The other energies are cool. And I can ooh and ahh over some of the fancy stuff out there. But I prefer plain old vanilla phasers.
Romulan plasma is hands down the best weapon type. Disruptor proc ftw, plus it's plasma so it get +9.5% dmg per science console on top of tac consoles. Nothing else, including fotm antiproton, comes anywhere close in dps.
For me, it all depends on what my character is and what they're flying.
Just a few examples:
ANY Fed Ship: Phasers
Galor: Spiral-Wave Disruptors
S'golth: Crescent Disruptors
D'deridex: Disruptors (Romulans using Plasma energy weapons never sat well with me; The color looks weird compared to what I'm used to seeing on the show. Torpedoes on the other hand...)
Chel Grett: Polarized Disruptors (Green looks better with the Breen aesthetic. On top of that, they're said to use Disruptors on the show. Also use with Plasma Torpedoes, for obvious reasons)
Jem'Hadar Dreadnought: Polarons
I prefer Voth Antiproton cannon-based weapons but that takes 1. money and B. Cannon-capable ships and Z. Still more money. In other circumstances I'll defer to disruptors (when I have a good amount of EC) and tetryon (when I don't.)
However I will use phasers for some FED ships because its hard to fly some of the more iconic ones (Sovereign, Galaxy, Defiant classes) and emit anything else.