My eng has been doing good with the mirror Voq'uv in pvp and pve, great buy and not to expensive so try it out.
As for the Jem Dreadnought, I don't have or want one but from what I have seen so far people are doing ok in pve with it, but it is failing miserably in pvp. A good eng should be able to tank one person for a long time, but all the people I have seen in this, mostly eng have popped quickly to my Fleet Defiant and Fleet Hoh'sus with no help. Do not use this ship in pvp, or get ready to see the respawn button a lot. This ship should be a priority target as it can do decent damage if left alone, but easy kill and can't escape or heal much.
Well, My eng in it was able to last for a long time it a 1v1 test duel with drunk/shimm. the biggest problem is that to become a better survivalist, you lose offensive punch. There are counters to the setup i was running, and by no means was it tuned perfectly (i dont duel, i just pew pew lol) I know I can tweak it to bring its damage potential up and/or better team support.
Can I do better my cruiser? yes. but I was having fun with the beast and I welcome the chance to keep working on it to make it work better for me.
ahh thank you! ill get to finding some decent polarons for the Vo'Quv
Polarons are good if you are already speccing into flow capacitors.
In general on pets, DPS if you get any at all comes from their projectiles: torps from BoPs, HYT from scorps, trics from Fer'Jai. Fer'Jai are the sturdiest thing out there right now. Orion Interceptors are more effective than I think they get credit for with their very low time to target and debuff. If you are going to use scorpions wait until tier 5 and get the best ones. They explode when the enemy looks at them but they usually fire off a HYT first and the re-launch on them is low.
The Kar'fi can throw some damage down range, the Vo'Quv not so much. As a sci with either of those I would invest in the subspace jump console so you can put a sub-nuc on someone in a timely manner. I've flow all 3 professions in a Kar'fi and I personally feel she deserves a Tac captain, but Sci definitely worked too.
Phasers are still king of PvP, but if you're not ready to spike when they proc, and a Sci Vo'Quv probably isn't, they may not be much of a game changer. Disruptor is a solid choice IMO. Plasma is cleared by HE of course but there's always the philosophy that getting your opponent to use HE prematurely is a good thing so they can't heal themselves or a teammate later.
Those two carriers are very different animals. Advice for the two will not be the same.
The Mirror Vo'Quv should be able to equip Birds Of Prey as pets. They give a very decent dps.
A strategy to do with the Birds of Prey Pets, is to place them on Follow. While they are on follow they will remain cloaked. Then, when you are ready for them to engage a target, just set them to attack. And if you can time it right and angle them in the right way, you can even get nasty Alpha strikes from them that can kill players as if they were an extra escort flying in.
As far as the Kar'fi goes, it depends on your build honestly. Fer'jai Frigates aren't so much damage monsters like Sophlogimo stated. They are more control based. Their powers of Aceton Field, High yield with their Chroniton Torpedoes, Tricobalt Mines, and (if you have the Advanced) their Tricobalt Torpedoes is more of a Stun and Disable based pet. Sure the Trics can hit hard and get kills, but they are also more likely to get shot down, unless you are also build around that same strategy.
A pet that not many seem to understand, that I like, is the Marauding Force. They can cause Boarding Party based subsystem disables, including Shield Disables. Are fast to launch and keep on the field of battle.
Other wise, stick with the Advanced Skull Fighters, or perhaps even the Elite Scorpion Fighters. Orion Fighters are also useful with their Photon Mines and subsystem disables they can provide.
As far as weaponry, I don't think I couldn't suggest the new Phased Polaron weapons.
With the Kar'fi, you can fly it a couple of different ways, from Beam Boat, to full Escort (4 DHC, 3 Turret) based weapon line up. It all depends on what Science powers you are also bringing with you. It's got a nice turn rate (A turn rate I wish the Jem'hadar Dreadnought shared >.<) and it's got a nice offensive lay out. Again it all depends on what your trying to accomplish.
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