Ingram is a nice young player but I'll take Brown any day of the week. He is the better shooter and defender right now, and the more explosive athlete.
Ingrams impressive handle for his size, and his size in general are some nice tools that he has. I don't know much about Ingram because I don't follow the Lakers but Brown definitely has the work ethic to continuously improve. Jaylen needs to improve his ball handling creativity and playmaking ability but he has flashed both of those traits especially in highschool where he was the #2 overall player and lead his basketball team to victory every night.
I believe that he will get better in these categories and eventually become a legitamate all-star in this league. At 21 years old, he is already an above average starter and does many things well (shoot, especially off the catch, defend, rebound, move without the ball). If you look at other top tier wings in the league such as Hayward, Jimmy Butler, and Kahwi Leonard, none of them were better than Jaylen Brown at age 21. Not saying he will be as good as those guys but he certainly has the work ethic to do so.
Ingram I beleive has similar upside. It's funny because many though the 2016 draft was a two-player draft (including myself). In fact, I was devistated when I got the notification on my phone that we had gotten the #3 pick instead of #1 or #2. But as soon as I learned we did have #3, Brown was my guy. I'm glad it's worked out so far.