That's a really damn hard question, because you have so many different kinds of players, who played in totally different times with different rules and different kinds of opponents. As a kid of the '80s, and a huge Larry Bird fan, my personal choice for favorite Laker is Magic (not counting one of my favorite all-time players--Karl Malone--since his stint was a short, desperate grab for a championship). George Mikan was probably the most dominant in his place and time, though he played for multiple leagues, and his Lakers weren't in LA. But Kareem was putting up gaudy numbers in his time, as did Wilt Chamberlain.
Kobe is in the top tier, but not nearly the best or most important Laker in my book. Had he won those early titles without Shaq, it may be a different story.