Anti-proton? You can craft, and buy them, but I've never seen them drop as loot.Are those something you buy with energy credits? Something you craft?...Phasers are good for causing subsystem damage (if critical), but otherwise offer generally decent DPS. I have a star cruiser (the new Odyssey), and use anti-proton beams myself, which are just a nice way to flay the crap out of whatever you're broadsiding.
The best of them, are the Borg ones.