Some games looked absolutely gorgeous on the C64, not blocky at all. Others were blocky, but you didn't mind that if the gameplay was good. Once you start to really get 'into' a game, you cease to notice the graphics anyway, they're there more for getting you into the game in the first place and for onlookers.
Some games on the C64 aren't available on the Speccy and they're absolutely brilliant. Stuff like Labyrinth (Activision), Manic Mansion, Pirates!,Creatures Defender of the Crown etc
Other games on the Speccy aren't available on C64, and again are fabulous - Cyclone, Deathchase 3D, 3D StarStrike, Atic Atac, Wild Bunch.
(yes I know there are later fan ports, but they don't count here)
Then there are some games that came out on both machines that are far better on the C64 - Kung Fu Master, Ikari Warriors, the Games series, Impossible Mission , Wizball etc.
There are some games that came out on both machines that are far better on the Speccy - Enduro Racer, R-Type, Bomb Jack, Chase HQ etc.
There are some where both versions are great , and are appreciated by fans in both camps - stuff like Bubble Bobble, Rainbow Islands, Commando, EHIS etc
Then there are the really interesting ones where each machine gets a different interpretation of the game based on the strengths of the machine - Amaurote, Carrier Command, Paradroid/Quazatron, Glider Rider etc.
So overall for every great Speccy game there's an equally great C64 game. The C64 had by far the best sound , and some average games were rescued because of the aceness of the SID (eg G'n'G), whilst some Speccy games had absolutely censored graphics but made up for it with awesome playability (eg Journeys End).
So it's absolutely a draw - BUT there are probably more Speccy games I go back to than the C64. But that's not because of the hardware, it's because of the games.
Mr Flibble says...
"Game over , boys!"