Basically, you can have a 30 min pvp against a tac escort with no winners, but that's the best u can hope for. In 1vs1 you CAN'T win, no matter the skills.
I disagree. I have both a tac and an engineer with the same build in the same type of escort. It does take longer to kill someone with an engineer, but I also survive a lot longer. At times, I prefer my tac, and at other times, I prefer my engineer. It all depends on who I'm fighting, and what they bring to the encounter.
Note: With my engineer, I can win more than 50% of my 1v1's with another escort.