I don't think you're going to get any useful information from either of those questions, I'm afraid. Different players will have different opinions because of personal playstyle, but even moreso because it varies from campaign to campaign. What is most dangerous or most useful varies
heavily based on your circumstances, so you're not going to be able to peg some favorite and then use it with the same effectiveness every time.
A big part of the goal of the game is to have every player analyzing their situation at all times. What abilities do your ships have in the current campaign? How about the enemy? Okay, how can you exploit your strengths and/or their weaknesses in this specific matchup? Paired with how you're comfortable with playing -- some people are by nature more defensive or more offensive, of course.
I'm sure some folks will weigh in with things they like to do personally, and there are some similar threads to that already in this subforum, but bear in mind there is no One Right Answer, not even close.
Not the answer you were looking for, I know, but I hope it helps all the same!