Depends if p1 or p8, and if budget is: untwinked, unlimited, or "SP unlimited" (30 atomus jewels and all cotws).
Imo for untwinked/cheap for p1-p4, wolf druid. Can go higher but then gear must be better.
For unlimited budget some variant around samael sword and harbinger oskill, you basically build wolf druid but as other class, more damage and tankier, possibly barb. This will work for all player counts. It's gonna be better than vojdin because you have way better aoe and move faster.
Honorable mention here would be mana sorc with ssu war staff, you are basically apocalypse/stormcall character than deals WAY more damage than those, and can stack mf still deal that damage. Worse than harbinger but also very fast and 1 shots entire screen, nice and clean.
Unlimited budget with all gear, then sky if the limit.