I recall once google came on the scene I ditched altavista and never looked back. I was a teen but my recollection was that Google included the relevant paragraph of text from the page shown in in the search results whereas altavista showed one line that was often indecipherable gobbledygook - perhaps the page title matched a keyword - and it made it so much easier to scroll through ten results and identify the one that was the highest quality

Plus the no fast no clutter homepage for google compared to how many links can we fit in one screen for the portals