It comes down to money and your ability to juggle power pips. Cost wise the A rated Clipper sans life support and sensors is 74 mill while the Python is 124 mill in comparison.
Full pips in engines the Clipper is faster so it can run away, but when turning that just means that it travels a longer distance. This often gives the look and feel of turning more quickly, but in reality when in the top of the blue zone they both turn very well with A rated engines. But Static, what if I drop the throttle to the bottom of the blue zone in the clipper? Well that will make you turn tighter, but it is time consuming to slow the Clipper down before a turn because she likes to go fast.
The Python is going to have about 100 more MJ in shields, has the ability to have more armor, has a longer jump range, larger power distributor, and more powerful hardpoints, but some peripherals come with a premium cost. In particular military composite on the Clipper is 18 million compared to the Pythons whopping 46 million credit price tag. Equally, using the term loosly, equipped
Pythonand
Clipperare worlds apart in price meaning the re-buy is also vastly different.
TL;DR Don't settle for an under equipped Python when you can buy a well equipped Clipper.