Didn't know they made 150s and 230s. I always remembers the bikes being 125s and 250s.
Anyway, growing up I was into MTBg and my younger brother into MotoX. He always had dirtbikes and still does. The 2 stroke 125 he had as a teen / young adult was VERY fast, the 250 he has now is a freakin beast. The 250 also weight much more than the 125, so weight is something you should also consider.