Knoxville easily,as others have mentioned,the payouts,the crowds,the way the town gets involved,businesses
etc.
It's like comparing Indy 500 vs the Little 500,Peyton Manning vs Jeff George,Bob Knight vs Lon Kruger,my bankroll vs Dennis Roth's,on & on.
Smackdown pays 10k to win,Knoxville pays 10k for 24th,first car not to transfer pays 1k.
Smackdown is good,Knoxville with its history & longevity,says it all.