What makes one browser better than another is how well it adheres to the published standards and so behaves in a predictable manner.
AbE:
In an ideal world a web page should display, look and feel the same on any computer, regardless of the browser used or specific display involved. Unfortunately, that is not currently the case.
The biggest issue is placement on a page, both horizontal and vertical, and a graceful way to control relative sizes of text, columns, rows, images.
Style sheets hold the promise of being able to do that, but only if all the browsers implement the standards as set out in the Style Standard.
Edited by jar, : add more info
Anyone so limited that they can only spell a word one way is severely handicapped!