1. Jedi, since obviously Vitiate is a lightsaber-wielding novice, we've got Luke Skywalker, and Yoda who can both outduel Bane and Sidious respectively, and then we've got the Hero of Tython backing them up, making this an obvious win. The Sith's only advantage here is Bane's orbalisks, which won't save him.
2. Sith, majorly because they are fighting on a DS Nexus, empowering all of them. Considering this, Sidious could create a Force Storm that can only really be countered by Luke, who will be busy fending off a DS nexus empowered Bane, while Yoda attempts to fend off Vitiate but ultimately fails. Then we have HoT who doesn't count for anything compared to his 3 competetors, rendering him useless.
3. I'd say the Jedi can win in a great battle. It's evidently going to start with Luke/Sidious and Yoda/Bane engaging in a ferocious lightsaber duel, while HoT takes on Vitiate in a Force/Saber fight. Sidious will unleash a Force Storm, that plunges the entire fight into peril, as everyone is getting sucked in along with the torn apart bits of planet. Luke is able to take control of the Force storm and direct it elsewhere, continuing the stumped fight. Now is when Bane attempts to unleash FL at Yoda, who absorbs the blast with his hands, and Palpatine unleashes FL at a concentrating Luke, who is barely able to difuse it with his saber in time. Emperor Vitiate continues to face HoT, but is certainly getting pushed back. Luke is able to push through Sidious's lightning via god power and slice his hands off, and have him at his mercy, which he doesn't get as Luke beheads him. Luke then goes to aid Yoda, and together they shitstomp Bane just in time for the HoT to finish off Vitiate, rendering a Jedi Victory. Then the Sith try to dominate the wills of the Jedi with their spirits, but are unable to overcome the strong wills of these 3, and the Sith's spirits disperse.