You can find all the joint locks and punches in each system how ever each arts concepts may differ. Taijiquan will take time to learn applications, Xingyiquan faster to learn applications and you may like it. I perfer boxing over Xingyiquan. If you are looking to deal with a bigger opponent you may want to look at judo and escrima. As yesterday I had to deal with a guy on drugs and paranoid and all I could think was take him down and choke because my punches and knife may not do much but a choke may be my best option.
Exactly, to choke and control would be a better option then punching and kicking. That's what I am looking for. A system then can make me control people no matter what size they are but at the same time it has striking system added to it. That's why hybrid between 2 systems was in my mind.