With the new SM Codex and all the rules, Stratagems, WL Traits, etc., I think Blood Angels might have a Challenger for the best "Smash Captain" variant:
-Take a Captain in Terminator Armor with Storm Shield/Thunder Hammer with "Master-Crafted" Relic for +1D (sot D4)
-Have this Captain taken from a White Scars Successor Chapter with the "Hungry for Battle" and "Tactical Withdrawal" Traits (so, +1" to Advance/Charge rolls and also can Fall back and Charge the same turn)
-Give the Captain the "The Imperium's Sword" WL Trait (gives you +1A/+1S on the charge and the ability to re-roll charge distances) and then take a second WL Trait from the White Scars Supplement, "Chogorian Storm" (gives +D3 attacks on the charge)
-Drop down Turn 2, use the White Scars Strat to roll 3D6, pick the highest two for the charge distance which, alongside the Chapter Trait and ability to re-roll charge distances, means you have a very solid chance of making that 9" charge.
-Once you have made that charge, the "Smash Captain" has 4A (base) + 1A (Shock Assault) +1A (Imperium's Sword WL Trait) +D3A (Chogorian Storm WL Trait) = between 7-9 x S10 AP-3 D4 attacks. If you use the new Space Marine Strat that gives a Terminator unit +1 to Hit, then all those attacks hit on a 2+, re-rolling 1s, so on average rolls you would have 8 successful hits. Against an Imperial Knight, that means you would make 5-6 wounds and 4-5 Unsaved Wounds.... at D4 each, that is between 16-20 damage total on the Knight, even without using Honour the Chapter to fight a second time. If you end up charging that same Imperial Knight on turn 3 and have the Assault Doctrine on (i.e. -1AP to his TH), then the Smash Captain has an average of 8 attacks, 7-8 hits, 5-6 wounds, 5-6 Unsaved Wounds, and 20-24 total damage inflicted on the Knight, all just fighting one time!
There are other ways to refine this even more (i.e. add a Librarian to cast "ride the Storm" on the TDA Captain and give him an additional 2" to his charge for an even more guaranteed charge), but overall I think this White Scars Successor "Smash Captain" will be quite deadly in the competitive scene.