In my opinion, the best ship for exploration really depends on where you'll be going and what route you'll take. Going to the rim, or above/below the galactic plane? Bigger jump range is very important then, as it'll allow you get farther. In more dense areas, a big jump range is nice as it'll get you to your destination faster, but not crucial. If, however, you are going on long expeditions, then I'd say that your cockpit view is just as important. You are going to be looking at it a lot, so best pick something you're the most satisfied with.
In your case, I'd second Odengard's suggestion: if you really prefer the T6's cockpit view, then you should try outfit it for exploration. I did a quick loadout, it can do 29.5 ly: see it
here.
That's more than enough for anywhere, unless you want to travel as far out into the rim as possible. (In which case the Anaconda is best, followed by the Asp and the DBE.)