[Exhibitman]

The question is context-dependent. If you are asking me to evaluate the Mickey Mantle and Willie Mays as prospects, I would take Mantle every time. He was rocket-fast and could hit with power from both sides. As a prospect he was a once in a lifetime player. After he tore up his knee, became an alcoholic, and started the cycle of abuse and injuries, his value sank quickly. Mays was not as great a prospect as Mantle but by the late 1950s had eclipsed Mantle in terms of value. Mantle's WAR numbers fell off dramatically after 1957. Mantle had 5 seasons with WAR > 8. Mays had 11 seasons with WAR > 8. By the time Mantle was 30 he was basically a good starting player. Mays was an exceptional player until he was 35 and a good starting player until he reached 40. As peak players, Mantle was measurably better. Mays's line for his greatest year [1954]:

1954 151 641 565 119 195 33 13 41 110 8 5 66 57 .345 .411 .667 1.078

WAR: 10.6

Mays had a higher WAR in 1965 [11.2] and his line there wasn't too shabby either:

1965 157 638 558 118 177 21 3 52 112 9 4 76 71 .317 .398 .645 1.043

Mantle's line for his [1956]:

1956 150 652 533 132 188 22 5 52 130 10 1 112 99 .353 .464 .705 1.169

WAR: 11.3

Of course, until either of them can go 18-8, 23-12 and 24-13 and pitch 31 innings with a 0.87 ERA in the World Series, and hit .342 with 714 HRs, neither of them is fit to carry Babe Ruth's bag.