[Vertigo models explained.]

Im looking into buying a vertigo 250cc.

there seems to be so many…. combats , busso’s.  The R2 which i believe is 2020. Then R3 which is 2021. The DL12..  then the Works an so on. 
I'm looking to by something newish, thst isnt to much for my clubman type/ non expert riding style. 
 

I cant seem to find out models in order of there range. For instance trs.. 

there lower end model is 250 r

then 250 rr, onto 250 gold being there more expert pro rider type.

any help on models would be greatly appreciated.

thank you