Cool thread. I find this fascinating as an American fan. I can't comment on the matchday atmosphere, but I can tell you about the perception of the clubs stateside. The average American sports fan has heard of Ars*nal but not Tottenham. For those that are familiar with English football the following associations are made with each club:
Ars*nal: Trendy, flashy, fashionable, EUROPEAN. Arrogant contemptuous wimpy fanbase with superficial knowledge. Used to be a boring defensive team, but have adopted a "continental" style of play utilizing a surplus of quick, short, accurate passes. They seem to think they invented the concept and all the fans comments and chants center around the idea, "We're the greatest - and Spurs are s**t". Despite their European style of play and domestic success - they have yet to win a trophy in Europe.
Tottenham: Authentic English club. Play an aggressive English game with homegrown talent. Consistently "second-best". Loyal, long-suffering, vocal and supportive fanbase with a bit of an inferiority complex and a hopeful but pessimistic outlook. Waiting for a return to the glory days. Ties to the Jewish community and managed, financially, in the stereotypical Jewish fashion - tight, profitable, little debt, strategic spending. Powerful firm associated with the club. Win an occassional domestic trophy but can't get over the hump.
Arsene Wenger & Harry Redknapp perfectly represent the two clubs in my mind.