I think what was meant here is that Tyrant matches a +1 STAB Crunch from MegaGodzilla so it could be assumed a SE is naturally stronger from Tyrant as well But you are also right there is very little difference other than do you want MegaGodzilla for your mega slot or not. If you want Mega T-Tar then use it but you don't have a big power gap between the two.
Now whenever Rock Head is released it'll be great of course and the Strong Jaw loss to Crunch and Elemental Fangs may not make a huge difference to some people but it'll be a difference. Granted, tyrantrum will now join the club of outrageously powerful stab-hitting mons like Darmanitan, Mega-Skywalker, etc but you'll now to change things to accomadate the change. One thing is for sure.....SJ Tyrantrum is a UU sweeper, RH Tyrantrum is an OU sweeper.
I was referring to this line in particular:
That means his stone edge out damages even more noticeably as tyrantrum gets stab on it.
Which is why I quoted it. This line isn't true because while Tyrantrum gets Strong jaw boost on Crunch, he only gets STAB on Stone edge. Strong Jaw is a 50% boost, so the damage of Mega TTar's Stone edge will be about the same as Tyrantrums, except you also have AMAZING bulky, the ability to pursuit trap, set up sand for your team, and you take no LO recoil.
The fact that Mega TTar is a mega is a moot point. If you want Mega TTar then you will take him. If you don't want him, and you take another mega, then you STILL aren't going to take Tyrantrum. The reason is simply because normal TTar also outclasses Strong Jaw Tyrantrum. It's stronger, bulkier, can pursuit trap, set up sand, etc. All of the things that Mega TTar can do, except with an item and less bulky (But still bulkier than Tyrantrum).
So if you don't want to use Mega TTar, then you'd just take normal TTar to fill this slot on your team.
Mark my words though, RH Tyrantrum will destroy this metagame lol, after a DD he outspeeds so many things, and doesn't give a crap about Talonflame or Mega Pinsir, he can OHKO Conkeldurr on the switch with Outrage and can survive a mach punch:
+1 252+ Atk Life Orb Tyrantrum Outrage vs. 120 HP / 0 Def Conkeldurr: 378-446 (99.21 - 117.06%) -- 93.75% chance to OHKO
252+ Atk Conkeldurr Mach Punch vs. 0 HP / 4 Def Tyrantrum: 132-156 (43.27 - 51.14%) -- 2.73% chance to 2HKO
Neither Keldeo nor Greninja (Both outsped after a DD) is safe:
+1 252+ Atk Life Orb Tyrantrum Outrage vs. 0 HP / 0 Def Keldeo: 398-468 (123.21 - 144.89%) -- guaranteed OHKO
+1 252+ Atk Life Orb Tyrantrum Head Smash vs. 0 HP / 4 Def Greninja: 625-737 (219.29 - 258.59%) -- guaranteed OHKO (He OHKO's with every attack)
Not Azumaril either:
252+ Atk Choice Band Huge Power Azumarill Aqua Jet vs. 0 HP / 4 Def (custom): 102-121 (33.44 - 39.67%) -- guaranteed 3HKO
+1 252+ Atk Life Orb Tyrantrum Head Smash vs. 252 HP / 0 Def Azumarill: 546-643 (135.14 - 159.15%) -- guaranteed OHKO
Not even freaking Lucario (Only barely with full special investment Vacuum Wave):
252+ Atk Life Orb Lucario Bullet Punch vs. 0 HP / 4 Def Tyrantrum: 143-172 (46.88 - 56.39%) -- 73.44% chance to 2HKO
252+ SpA Life Orb Lucario Vacuum Wave vs. 0 HP / 0 SpD Tyrantrum: 265-312 (86.88 - 102.29%) -- 12.5% chance to OHKO
+1 252+ Atk Life Orb Tyrantrum Earthquake vs. 4 HP / 0 Def Lucario: 541-637 (191.84 - 225.88%) -- guaranteed OHKO
Mamoswine has no chance unless he has an unbroken sash and doesn't get hit on the switch:
252 Atk Life Orb Mamoswine Ice Shard vs. 0 HP / 4 Def Tyrantrum: 148-174 (48.52 - 57.04%) -- 89.06% chance to 2HKO
+1 252+ Atk Life Orb Tyrantrum Head Smash vs. 0 HP / 4 Def Mamoswine: 542-640 (150.13 - 177.28%) -- guaranteed OHKO (Also OHKO's with Outrage)
Mother fucking CB Scizor only has a 50% chance to OHKO while being obliterated by Head Smash:
252+ Atk Choice Band Technician Scizor Bullet Punch vs. 0 HP / 4 Def (custom): 278-330 (91.14 - 108.19%) -- 50% chance to OHKO
+1 252+ Atk Life Orb Tyrantrum Head Smash vs. 248 HP / 0 Def Scizor: 452-534 (131.77 - 155.68%) -- guaranteed OHKO
What else is there? I don't even know. Physical walls?
0 Atk Hippowdon Earthquake vs. 0 HP / 4 Def Tyrantrum: 204-242 (66.88 - 79.34%) -- guaranteed 2HKO
+1 252+ Atk Life Orb Tyrantrum Outrage vs. 252 HP / 252+ Def Hippowdon: 231-274 (55 - 65.23%) -- guaranteed 2HKO
0 Atk Gliscor Earthquake vs. 0 HP / 4 Def Tyranitar: 180-212 (59.01 - 69.5%) -- guaranteed 2HKO
+1 252+ Atk Life Orb Tyrantrum Head Smash vs. 244 HP / 248+ Def Gliscor: 281-331 (79.82 - 94.03%) -- guaranteed 2HKO
76 Atk Landorus-T Earthquake vs. 0 HP / 4 Def Tyrantrum: 270-320 (88.52 - 104.91%) -- 31.25% chance to OHKO
252+ Atk Life Orb Tyrantrum Head Smash vs. 252 HP / 180+ Def Landorus-T: 250-294 (65.44 - 76.96%) -- guaranteed 2HKO
Landorus and Scizor are the only ones who can kill him and that's only if they don't get hit on the switch! That said, he's going to fear powerful neutral Choice Scarf special revenge killers, or weak SE choice scarf special hits, or strong SE Choice scarf hits. If it's faster than him and can land a strong special attack, he's probably going down. However, most of the things that can do that are frail, and are going to be hit for tons if not OHKO'd on the switch.
He's a goddamn dangerous motherfucker.