my favorite "star trek v star wars" fanfic i ever read was actually really fair and obviously written by a fan of both star franchises (or stargate lol)
i have no idea what it was called. but it acknowledged the strengths and weaknesses each would have an created a neat scenario that resulted in a plausible "worlds collide" event that in itself was very star trek (dimensional rift kind of thing).
it was basically Empire v Federation. the Empire blew up Mars. hyperspace was insanely fast and gave the star destroyers a massive advantage but federation ships were packing incredible firepower and maneuverability. there were good stakes and it was fun.
my only bias was enjoying space fascists eventually get fucked up by plucky inventive space communists once they realized they were basically fighting the equivalent of the "coast guard".