Well with an A500 you're stuck with browsing in max 32 (or 16?) colours due to chipset limitations. TBH the best option for browsing on ECS/OCS would be with Lynx...
You can't browse with 32 colours on an A500 - there's no browser that works in low res (..and who would want it to?). 16 colours is the max.
Lynx? No, the best is definitely IBrowse. It has the best jpeg dithering - and you certainly need that when you've only got 16 colours.