Why isn't there an option for both? I've only seen the new series myself, but I know that there are people who are fans of both.

I haven't seen much of the classic yet, but i'd like to.

To be completely honest, I'd prefer to make the final judgement when I get to witness all The Doctors and their individual adventures but they no longer sell Classic Who nor Nu Who in the stores in my country anymore so the possibility of waiting is hopeless therefore I will go with the New Series. :)

I can't answer because I generally enjoy both versions and I really can't pick between them. While I do think that the Classic series has some of the best plots, I also enjoy the New series for the quality that the classics lacked.

3rd and 10th Doctors are my two favorites, I could never pick between them.

So I think an option for both would be better because I love both series.

Both, as there's no option for it.