I think it's the match between the strongest players. Topalov is very deep tactician with (probably) the strongest opening repertoire. In some games he is going for big risks which is double edged. On the other hand Anand is very strong on "short" tactics and he has very balanced style. No big risks, no long shots and no "short" tactic missed.
I hope Topalov would win. Either way I believe this match will be memorable.
Viswanathan Anand beat Veselin Topalov 23 to 14, with 46 draws, according to chessgames.com