The post is very vague, but I see what the idea here is. You’re looking to form some kind of market research thing where we can cluster information on cars that people make and see which ones are competitors.
For example, somebody posts and says hey I made a D segment premium RWD sedan. Then a whole bunch of people might look at it and pipe up and say hey I did the same kind of thing, here’s mine, and then you can compare the stats etc. In real life, there’s no single way to define better because it depends on the kind of person who buys what car and how much of a stickler they are for specific characteristics (e.g. the Muscle market). This is one way in which there is always tension between the metric of Automation and the real world which isn’t often driven on data and rational thought (otherwise we wouldn’t have so many fucking crossovers on the roads).
This may be helpful for looking for specific things like if somebody else has covered your niche. The real life rationale is that closely matched products can create competition which creates buzz which should improve brand awareness and interest in both.
The problem here is that if you have just one thread for the lot, it can get really messy.