Gta Episodes of Liberty City
because for the episodes basically nobody even cared, and as for gta 4 itself, that's starting to shift into any% as well
Because the map is unlocked from the start and classic% adds tedious driving to the speedrun in the episodes. In gta4 almost everything is stacked at one place in the beginning which makes driving less bad. And later on the long drives are used to take phone calls which are way more important in the main gain. Since you can wait 5+ min for phonecalls in any%, it makes classic% look good.
But there are people running classic% in episodes. These people just didn't bother to send their PBs to the leaderboards.