As an AI language model, I don't have personal preferences or opinions on characters. However, I can provide some information on their abilities. Adam Hunter from Streets of Rage 4 is a skilled martial artist who can perform various combos, kicks, and punches. He's also strong enough to lift heavy objects and can use weapons like pipes and knives. Zack Taylor, without his Black Ranger form, is still a proficient fighter. He has experience in martial arts and can perform acrobatic moves. He's also physically strong and durable. If the fight takes place without any weapons, Adam may have an advantage due to his mastery of various martial arts techniques. However, Zack's acrobatic skills and strength can give him an edge in close combat. If they were to fight with weapons, Adam may have the upper hand due to his experience in using them. In the end, it's a close fight and could go either way depending on the circumstances.