Which is better for a rookie?

ok... who is better not statistic wise but pure skill wise... who has more potential/pure skill? Robin Lopez or Brook Lopez? yes i know they are both not very good. Brook has put up better numbers but with more minutes. Playing on the nets (who don't have very good big men) brook gets more starting minutes. on the other hand Robin Lopez is on the phoenix suns. he is playing behind shaq and amare. two great big men. now which is better for a rookie. learning from some of the best, or learning yourself by getting more minutes???