Ballmer was Gates' old frat buddy. I think it's terribly unfair to compare Tim Cook to him. Cook was extremely successful as COO, the debate is whether he's the right guy leading Apple through these highly competitive times.
I'm not sure if Ballmer was ever very successful at anything, except for basically going all-in on Microsoft stock I believe in the late 80s; and that bet turned out to be be very right. Microsoft did grow steadily under his CEO tenure, but I'm not sure much of that is attributable to him.
You make a good point. I guess I just meant that in both cases, Balmer and Cook were given the keys to billion dollar corporations that their predecessors built from the ground up. I won't deny Cook is a great executive as you have to be at that level. I just mean that being the guy is a lot different than being the guy the other guy counts on. Balmer lacked the forward thinking vision that Gates had, and in response the payday came but the corporation as a whole started to decline. Cook is at a crucial juncture, as the next 10 years are dependent on decisions he makes today.
As far Gates and Jobs, Jobs was arguably the stronger personality but also with bigger scruples. I think both were once-in-a-generation minds. Now, if Cook ends up becoming what Eisner was in his earlier tenure at Disney then it might be truly a sight to see. Personally, I would like to see Apple shed it's niche personality and become a real player in the personal computing world again. Iphones are great for stock prices but opportunities for future innovation are limited unless they can dramatically change the way we use our phones. Microsoft needs some competition with some real money behind it, and Linux will never fit the bill on those terms.