Both Kareem Abdul-Jabbar and Wilt Chamberlain are true basketball legends! Both are considered as greatest and most dominant players in the history of the NBA. Cannot really judge which of those two Hall of Famers was better, but I have a slight bias towards Kareem.
Kareem is still all-time leading scorer of the NBA, with amazing 38,387 points. "Ferdinand Lewis Alcindor" won 6 NBA championships and an awesome record 6 regular NBA season MVP Awards during his career at Milwaukee Bucks and the L.A. Lakers from 1969 to 1989.
When Abdul-Jabbar retired, he was the NBA's all-time leader in points scored, games played, minutes played, field goals made, field goal attempts, blocked shots, defensive rebounds - and last but not least also personal fouls. Wow.
Wilton Norman "Wilt" Chamberlain on the other holds several official NBA all-time records, e.g. setting records in many scoring, rebounding and durability categories. Most notably: He is the only player in NBA history to average more than 40 and 50 points in a season or score 100 points in a single NBA game. Astonishing. While playing for the Philadelphia/San Francisco Warriors, the Philadelphia 76ers and the Los Angeles Lakers (before he also had fun at the Harlem Globetrotters), Chamberlain won e.g. 2 championships, 4 regular NBA season and one NBA finals MVP award.
Check out this rare video of Kareem Abdul-Jabbar and Wilt Chamberlain :
Read Kareem Abdul-Jabbar's and Wilt Chamberlain's amazing bios on Wikipedia: