Mmm, I had horse many times in my life. To me it tastes like horse. I'd say it has a bit more taste than beef (beef is quite bland IMHO, not really a fan) so more similar to pork in this regard. But less fat than pork. It is about as chewy as good lamb. For me personally horse is a better lean steak than beef. But beef is better when it has a lot of fat. Basically, horse meat has taste, but in beef fat has taste.