It’s a hard choice to make,Poligons offer a more realistic (Not often the case,look at cel shaded graphics)view of games,but with it came many games that are pure eye candy and no fun,but it also gots very good games like FFX.
On the other hand,sprites offer a more fun look at the game and many developers concentrate more on the game that at eye candy (Again there are exeptions)
If i could i would say a tie between the two,but if i really had to choose i would choose sprites,just look at Disgaea and Valkyrie Profile which i consider pure fun to play.
I like sprites because they make the games look more Anime-like. Most Polygon games still look too “blocky”. But then again, it all depends on the game’s atmosphere. FF Tactics and Saga Frontier 2 were too serious to have had such cartoony graphics, in my opinion.