Okay I honestly ignored your question because I knew my answers would anger people, but meh, here goes.
1. Cobra was the first real ship I could afford, so to me it's a noob ship not worthy of returning back to. Can't say I have many fond memories in that thing.
2. Cobra is ugly. It's just SO ugly.
3. iCourier is a premium ship requiring Rep unlocks, so to me it should be superior in nearly every aspect to the Cobra. Not to mention the millions of credits price difference.
I know there are veterans who swear by their little engineered Cobra and that's great for them, it's just not for me. Still haven't decided, but I think the Krait Phantom would be my ideal bubble-bus. If I can be pried out of my Anaconda....