Disagree. A company's stock price directly correlates to what the market values the future earnings of the company at.
Company doesn't have a future? Down to zero with you.
Company doesn't have a future? Down to zero with you.
Comparing their market caps? A little better. Comparing how their prices have changed over time? Probably a lot better. Comparing the two prices by themselves? Useless.
RIM: 6.79B Google: 263.63B
Chart comparing their stock prices: https://www.google.com/finance?chdnp=1&chdd=1&chds=1...
I believe the data I've added reinforces my original argument.