The answer to this question largely depends on individual opinion. Boxing is usually considered more of a technical sport, while UFC is more of a full-contact combat sport. In terms of brutality, UFC often has more intense physical contact as strikers use techniques such as elbows, kicking and submission holds, whereas boxing is limited to punches. Additionally, UFC allows fights to continue until a clear winner is determined through either knockout or submission, whereas boxing typically stops when one fighter can no longer continue. So in this sense, some may consider UFC to be more brutal than boxing.