It costs more to outfit than the conda. it is only cheaper as a base model.Not quite - the ideal placement of the L hard points for turret usage on the T10D does not become any less pertinent with the release of the Chieftain line of ships.
As for comparing the T10D's performance with the others - I have found it to be at an appropriate level of ability given it's cost. I have personally found it superior to the Anaconda in many respects. The Corvette and Cutter arguably beat both the other two but none of them eclipse the others in the universal sense of the term.
Ultimately, it is moot how many people fly any given ship - every single ship in ED has it's positive and negative points and it would be insane if they did not and were all effectively made to be clones of each other. That is effectively what threads like this head towards, no true choice - just different shades of horse armour.