Which dirtbike should I get? Im debating.....?

Hi, I am 15 . 5ft 10 and I weigh about 140-145 lbs, but I am very strong. I am looking for a dirt bike. Has to be a four stroke. I am looking for something that I can rip through the woods with, like the woods in northern maine, but also do some supercross as well. My dad said he will consider 2 bikes.......CRF 230F and a KTM EXC 250. Which is a better bike, or if you have another idea for a bike that fits my qualifications, then what would be the bike?