Necro, also, I thought this was MGS Raiden, man, we were all fooled--
But, I assessed the reasons above and I'm going to vote on Raiden.
Why? First of all...
AP: Raiden seems to have the gap closed here in his favor, it's 10 > 7 tons, so he could likely take in more than what Jotaro can dish out.
Toughness: Raiden's got this one, mostly because of the fact he's an MK fighter, he's taken more punishment and serious wounds than what I've seen Jotaro get hit with, especially with how MK fighters having X-Ray's, Raiden can get right back up even after having several bones broken or impalements to the body, meaning that Raiden likely won't go down that easy after being hit several times by Star Platinum.
Speed: Speed is equalized, but from what I understand, Stand's speeds aren't equalized because they're a summon, correct me if I'm wrong, this means the speed is in Jotaro's favor with Star Platinum.
Powers & Abilities: Raiden, he has much more versatility in his arsenal.
In Conclusion: In the end, I'm thinking on Raiden here, and feeling a bit conflicted too. While Jotaro's Star Platinum easily is much quicker than Raiden, I still think Raiden could likely just spam teleportation, and just keep spamming his teleportation around to fool Jotaro whilst also hitting with enough lightning to put him down, or even generate electric traps that Jotaro could accidentally step into when he least expects it. Since his electric is capable of paralyzing people, he just needs to likely land the big one and then just keep electrocuting him until he's done. That and he could simply blind him beforehand with light, like DIO tried doing with blood, so I'm voting Raiden.