Are there any benefits of a bigger Champion?

Related Question: Is Feral Warwick skin bigger?

In the related question, I learned that different champions have different sized "hitbox." I also learned that Chogath, Nasus, and Renekton's ultimates can increase the size of these hitboxes. I also assume surge, greater relic and Wild Growth will also increase this hitbox as it increases the size of the Champion.

My question is, other than the direct benefits that is gained, are there any other benefits of a bigger Champion? To me a bigger Champion means a bigger target to aim for by enemy skillshots.

By direct benefit I mean the skill's direct active buffs.

  • Nasus Health Gain, AoE and AD increase
  • Renekton Health Gain, AoE, and Fury regeneration
  • Cho'gath "permanent" health gain
  • Surge's AS and AP increase
  • etc...

Solution 1:

[..] a bigger Champion means a bigger target to aim for by enemy skillshots.

This is correct, but isn't necessarily a disadvantage. Most of the characters with large+ hitboxes have more hp, armor, magic resist, etc and are better suited for taking damage. With a larger hitbox, it's easier to intercept skillshots and other abilities to protect squishier allies.

Also, characters with large hitboxes can stand on "top" of other champions, making them harder to target.

Other than this, I can't think of any direct advantage provided by a larger hitbox. Spells that increase the hitbox often directly affect the champions stats (think of how Cho'Gath gains HP with each feast), but the size increase itself does nothing.

Solution 2:

No, there is no benefit from an increased hitbox.

However, there is often an incidental benefit, in that you'll note that only Tanky characters get these size increases in the first place, which means they're more likely to intercept skillshots aimed at their smaller, squishier, brethren.

In the case of Surge / Relic, the size increase helps let them know that they're under the effects of a powerful buff, which might change their targeting or focus strategy.