Yoda and Sidious vs Dumbledore and Voldemort

All out.
Armed with standard saber and wand

Voldemort solos Team 1.

sidious solos voldemort, his crew, and all of hogwarts

If this is Sidious from the latest movie he absolutely slaughters. Depending on the starting distance, even Prequel or original Palpatine could zap them from the start.

Technically both force users should be capable of quick neck snaps.

Though they might be vulnerable to possession if they snap Tommy's neck. Unless all his phylacteries whoops horcruxes are destroyed.

Voldemort solos. Seriously Palpatine was beat by a girl with two sabers. Voldemort has way too many options and is far better at the long ranged combat game than I just shoot fl and if you can block or avoid it the old man dies.