I've heard a few times that the Wii U provides faster load times relative to the Wii, which may be useful for multi-stage/sports runs. How much is the difference in load times and would it be worth it to buy a Wii U just for that purpose?

Personally, I’m beginning to think this rule is becoming unnecessary. I’ve ran ILs many times as we all know, so it’s not like IL records from multi-stage runs are somehow tainted. I propose changing the timing to starting on “next stage”, and the loading time is exactly the same as clicking on the level from the menu. 10 and 20 stage runs are hard too! And IL runs on them should be perfectly valid.