Depends on your definition of "long"...
For the Sothis missions, a long range (>50ly jump without cargo) conda is great, you don't take so long between turnarounds.
For the Robigo ones, the Python was the best because of the landing pad size.
If you're smuggling, then the Clipper is fast enough to evade scans but a bit tricky when powering into the station without being scanned.
For exploration, consider where you're going to go. For star to star exploration, anything with enough slots for the ADS, Surface scanner, fuel scoop is sufficient. You may want to add shield and an SRV hangar.
If you want to get to Sag A quickly, then it's a choice of AspX or Conda. These can exit supercruise, ADS honk, scoop and supercruise in less than a minute. The DBX takes longer to refuel by scooping so there's a temptation to fly too close to the sun.
Reckon on 22 minutes per 1000ly unless you stop en route.