Arcann stomps Vader; he defeated HoT handily, while HoT by Act 2 (around the time of his fight with Scourge) was already clearly superior to prime Vader.
Valkorion is superior to Sidious on his own, although, quoting myself... "Valkorion is superior to Luke in every account as far as the Force goes; one can argue though that because of them being somewhere in the same league, Luke can resist him enough for the lightsaber to count, and fighting against the lightsaber with the Force is simply ten times more taxing, especially with Luke's speed." - just replace Luke with Palpatine and it's the same.
Still, after Arcann joins Valkorion, with Thexan serving as the additional destruction, Sidious gets killed in short order.
Team 2 10/10. 10/10 with immense ease in the Force round. In the sabers round probably they lose, though.