Azumarill hands down :I
- Superior Overall Bulk
Azumarill has bulk of 100/80/80
Slurpuff is 82/86/75
Also, Slurpuff needs to invest in speed to effectively use Unburden - Azumarill does not need to. So it has much better bulk in the competitive scenario.
- Much higher Attack (factoring in Huge Power)
Slurpuff has 284 Attack (252 EVs, Adamant Nature)
Azumarill has 436 Attack (252 EVs, Adamant Nature, Huge Power)
- Priority Aqua Jet
This is the reason Azumarill can forego running speed. Aqua Jet gives it much needed priority with Slurpuff lacks, and prevents most revenge killers. Slurpuff can still be outrun by fast Scarfers. Azumarill can't, since priority > speed.
- Better physical coverage
Slurpuff has 2 physical moves that are used - Play Rough and Return. Wow. Such great move set.
Azumarill gets Waterfall, Aqua Jet, Play Rough, Knock Off, Superpower etc.
- Azumarill is more versatile
You can bluff non-Belly Drum sets like Choice Band or AV for Azumarill, since they're very common as well. However Slurpuff? The only use it really has is Belly Drum.
- Forces more switches, more immediate firepower
Azumarill's immediate firepower, courtesy of Huge Power, means it can force more switches since the opponent fears taking a powerful STAB to the face. It's ability to run different sets also is taken into account. Did I mention it isn't completely walled by every second steel type, unlike Slurpuff?
- It's OU
OU > NU. #FACT
Azumarill is in OU, Slurpuff is in NU. There's a reason for that, and it's not because Slurpuff is superior.
- Azumarill isn't a cupcake
- Azumarill isn't Pink
Why do I not like pink?
Here's an interesting fact:
It's against the law to wear hot pink pants on Sunday afternoons in Victoria, Australia. ;>
Jump onto Smogon for half decent Azumarill sets, or the only viable Slurpuff set