Rumble fighters zin taekwondo or mao gong?

Ok so i have 22k carats on rumble fighters and i have zin taekwondo. I am wondering if zin taekwondo or mao gong is better for spamming kicks? Or mao gong is just plain better.Because if i sell my zin taekwondo for 7k ill have enough for mao gong please tell me which is better ty