Wrestling is my favorite. I'd like to start boxing, muay thai, or BJJ, but it's just a cost issue honestly. I feel like MMA (by extension, kickboxing and BJJ classes) has become a sort of trend, especially among teenagers/young adults, which is probably one of the reasons why classes cost so much lately. I know lots of people at my wrestling gym who do several martial arts at a time and it's got to be pretty hard on their free time.
Outside of drilling and live wrestling, it's really rewarding when I get to teach beginners little movements like relaxing their arms in their stance or different ways to fake shots.