Can we see the list anyway? Be warned we will argue about it for several pages.
Sure. Roughly speaking, and only counting the realistic contenders from each army (so, skipping goblin bosses, for example), when you want the MAXIMUM EFFORT facepunching, it goes like this;
Tier 1: Chaos Lords, Vampire Lords, Saurus Oldbloods, Ogre Tyrants, Doombulls.
All of these have powerful base statlines, while Chaos Lords and Vampires both have access to additional 'magic items' on top of the normal limits in the form of mutations and bloodline powers. Ogres are just really beefy, and Doombulls crank that up even further. Saurus Oldbloods barely make this list, but they still get a special rule or two that sets them above other heavyweights.
I should probably count Daemons of Chaos here too because, you know, Greater Daemons, but honestly? Screw that book. Oh, and I guess Verminlords should be up here too.
Tier 2: Orc Warbosses, Dwarf Lords, Tomb Kings, Beastlords, Treeman Ancients.
These still have beefy statlines, but they tend to be not quite
as beefy as the superstars, or the heavy stats are basically all they have. Dwarfs in particular are the first entry on the list without Strength 5, but they get a slightly larger magic items allowance, and runes are easier to make nasty combo's with than the often-truncated magic items lists of 8th ed. Treemen have an
incredibly punchy statline, but they're let down by their few attacks and lack of magic items.
Tier 3: Basically all the elves, Bretonnian Dukes.
These have pretty good stats, but they're not
as good where it counts as the ones above. Strength and Toughness are just too much of a big deal. Bretonnian Dukes get some neat special rules from Vows and the Lady's Blessing, but like all Bretonnians, they rely heavily on the charge, and they are still only human.
Tier 4: Generals of the Empire, and their counterparts from minor army books like Kislev and so on. Skaven Warlords.
These guys aren't really meant to be combat monsters, and it shows. They don't have any standout stats, and they don't really have anything special to make up for that. They're A Lord, if you kit them out right they'll do the business, but they're not heavyweights.