A few weeks back, in my post on SPIDER-MAN: BLUE, I mentioned that I preferred John Romita's wall-crawler over Steve Ditko's. Here's why:
To most fans -- especially the historians among them -- there is no contest. Steve Ditko created or co-created Spider-Man, Aunt May, J. Jonah Jameson, Gwen Stacy, Flash Thompson, Dr. Octopus, the Green Goblin, Electro, the Lizard, the Vulture, Kraven, Mysterio, and so many more. Ditko gave us the "Master Planner" saga, and Spider-Man lifting the rubble off his shoulders. Without Steve Ditko, Spider-Man, his allies and his enemies would not exist.
But without John Romita, those same characters would not exist as we know them now. Romita's lasting contributions as far as original characters is much smaller than Ditko's, but he did give us Joe Robertson and the Kingpin, at the very least. Mostly, however, he re-used Ditko's villains on a regular basis.
But, all that said -- and taking Ditko's contributions for granted as the starting point -- I much prefer John Romita on Spider-Man. Romita's artwork is far more attractive to me. All Ditko's characters are very... quirky looking, to say the least. Ditko's Spider-Man lives in a dirty, mundane world. Romita's inhabits a glamorous universe where every man is dashing and handsome, and every woman is beautiful and sexy. It may not be as "realistic" as Ditko's interpretation, but it's a lot more pleasing to look at.