Stumpjumper that is a good data: "Trek Fuel 90 disc", if you can explain it more for me i will be very thankful.-
About your question, i can't answer it, i don't have informations about that brands. But some products that come from the same owner sometimes are quite differents, example: forks RST (now the official name is RST USA) and MOZO.-
RacerX i saw TITUS but i never pay attention to that bikes, now you told me this i will going to get information about it.-
I agree in Specialized and Santa Cruz.-
"Not incluiding custom makers because..." i'm not so sure about that. You have good and bad welders...