I lived and worked in Istanbul for several years. Never actually went to a football game but, if asked (which happened often - mostly taxi drivers enquiring), I would always say that Besiktas was my preferred team because they play in black & white like Fulham.
Slightly regret never going to a game. For a period (until they built a big hotel in the way) I could actually see down the hill from my office to Besiktas's ground across the road from the Dolmabahce Palace. Actually, another good reason to pick Besiktas - if you think the location of Craven Cottage by the Thames is cool, Vodafone Park (which was the Inonu Stadyum when I was there) is even more spectacular, next to the Bosphorus and a proper palace and the only top flight ground where you could see two continents.
I did see Madonna perform there back in the early 90s....