LogFAQs > #979861029

I don't really feel like DP were necessarily "jank" compared to Platinum, they play/feel quite similar the vast majority of the time, but Plat handles one particular scene in the climax of the story in a different way from DP, and that difference alone makes it worth playing IMO.

Plat also does have more in the way of postgame content (much like Emerald) that you'll want to play that one instead if that sort of thing interests you. If you're just the sort to stop playing once you beat the league though, then that won't matter.