I asked this cuz like, why is qirex fastest pick in venom but not in rapier and that its auricom this time? I need an explanation tho.

You are free to pick whichever ship you want. Some have higher top speed, others have better acceleration and/or handling. It could be that the Auricom is best suited for that particular track and class, whereas Qirex has the advantage in the slower Venom class.

the Auricom is the best on every Rapier track. The Qirex should be IMO as it is really hard to handle, but they didn't give it enough speed. For Vector it is really messed up, the Ag Systems is the fastest by a lot, except for Altima. The harder to handle ships should be the fastest if you can control them correctly