He's probably a 3A, maybe a 2B. He seems to have a combo of mostly wavy texture with curls. Try to think about what his hair would look like if it were longer, how his texture would fall. 4a are smaller, tighter defined curls. 3b are a little more looser, defined curls (like the youtuber Mahoganycurls). His curls don't seem that pronounced, although I do see them. His hair looks to be both wavy and curl.