Warcraft 3 
Starcraft Overall Comparison Starcraft was a relaly good fast nice game. spent loads of hours on Bnet playing SC.
but when i discovered WC3.. it was all over.
Starcraft was good. but with a foodcap of 200 the battles where so massed. no control. no micro. en most of the time. no skill.
if you were fast. youd win.
protoss rush ftw ;)
WC3 on the otherhand had 'only' a foodcap of 100. but with a hero which had skills. the game was far more interesting.
more micro. not only mass units would determine who would win. but how you use them.
so
wc3>sc
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Comments
On the other hand, starcraft seemed to have much more strategy. While large numbers helped, a few units could take out tons if they were positioned correctly. The rushing was a little ridiculous but if you got past that it was an amazing game.
I am going to go back to WC3 as I have been getting back into the rts's lately. So I may edit this comment if i discover WC3 is something more than I originally got out of it.
also i like the fact that you can use heroes, as stated before, with skills. these can change a battle or even a game in a split second.
you should surely give wc3 a chance, but i warn you, before yu go play online, play the campaign and maybe some lan games with some friends. cus if youre new in the game and you start playing online, you will mostlikely be slaughtered :P