Atlas mk II FOR LIFE. It's slow, sluggish, heavy and somewhat fragile for its size but I will never relinquish the power of two accelerated mjolnirs. Sure, you can outmaneuver it, sure you can probably burst it down, but GODS HELP YOUR PUNY, FRAGILE SOUL if you get caught in front of my Atlas II and my accelerator is up. BWUMPBWUMP BWUMPBWUMP BWUMPBWUMP BWUMPBWUMP BWUMPBWUMP KABOOM. What's that? You brought fighters? That's cute; I BROUGHT LOCUSTS. Few ships can do exactly what it can do, though you must accept some heavy tradeoffs to do so; I find the challenge worthwhile, especially for the price. Sure, a paragon can beat an atlas II...but can it beat THREE of them for the same or similar cost? Heheheheheheh...
It's also a respectable logistics vessel on the side. There's just so much to love; it's like captain Sysko said: "She's got flaws, but she's got teeth."