How so?Landing SE hits on Dragon, Flying, Grass, Ground, Psychic and Ghost types is mediocre, but Landing SE hits on Fire,Rock and Ground is better coverage?
Weavile has higher speed and has priority of it's own(Ice Shard) so slower priority users are still left in the dust.
Feraligatr has BAD speed and only decent attack, while Weavile has much better attack and speed.
With mons like Latios, Gengar and Alakazam fairly common, Weavile helps keep these mons in check.
Let's compare Weavile vs Feraligatr on a mon that takes neutral damage from both mon's most powerful(and viable, Hydro Cannon not counted) STAB: Eviolite Porygon2 (just for comparison) after a Swords Dance with 252 Atk Life Orb Adamant Nature on each:
+2 252+ Atk Life Orb Feraligatr Waterfall vs. 252 HP / 176+ Def Eviolite Porygon2: 177-211 (47.32 - 56.41%) -- 81.25% chance to 2HKO
+2 252+ Atk Life Orb Weavile Ice Punch vs. 252 HP / 176+ Def Eviolite Porygon2: 183-216 (48.93 - 57.75%) -- 95.31% chance to 2HKO
That's right, Weavile does more damage(minimally) despite the higher base power of Waterfall.
Let's take a mon weak to both their STABs and see how they fare with 252 Atk Adamant Life Orb: Hippowdon
252+ Atk Life Orb Feraligatr Waterfall vs. 252 HP / 4 Def Hippowdon: 281-330 (66.9 - 78.57%) -- guaranteed 2HKO
252+ Atk Life Orb Weavile Ice Punch vs. 252 HP / 4 Def Hippowdon: 283-338 (67.38 - 80.47%) -- guaranteed 2HKO
Once again, Weavile consistently does more damage. So how exactly does Feraligatr claim to be better than Weavile? Weavile outspeeds and beats Dragon-types that rule the tier as of now. Can Feraligatr stake that claim?
Feraligatr needs support in the form of rain to sweep, whereas Weavile needs no support to sweep: a simple testament to the fact that Weavile is undisputedly better.
This is the 1850 usage of both:
Feraligatr: 0.38726% : 115'th in usage
Weavile: 2.59516%: 54'th in usage
I believe the 1850 stats show just how more viable Weavile is than Feraligatr(being used almost 7 times more) which is why
Weavile for B-Rank
Edit at Punchshroom:
Firstly, the simple fact that Feraligatr needs rain to sweep while Weavile does not is indicative of the gap between the mons, which is why Weavile should be B+.
Secondly, while Weavile is weak to priority:
a) It has it's own form of priority meaning priority vs priority chances are Weavile is attacking first.
b) Opponents do not need priority to deal with Feraligatr: the majority of the tier outspeeds and OHKOes it anyways. Rain is a double-edged sword when it comes to sweeping: come sun and Feraligatr does horribly. The sheer fact that it relies on rain makes Feraligatr VERY unreliable.
Thirdly, Weavile can also run Brick Break if Low Kick doesn't hit hard enough so the argument is invalid.
Fourthly, in a meta filled with Dragons, Feraligatr's Ice Punch is useless because every dragon in OU outspeeds and can OHKO. On the other hand, Weavile outspeeds and can OHKO the exact same dragons, making Weavile a far bigger threat to deal with.
Honestly, any player in OU is more worried that Weavile can sweep his team as opposed to Feraligatr.
There's a reason Feraligatr's RU and Weavile is UU: it's because Weavile is simply more viable in the current meta.