Heimer's RE has more range than RW
I'm not witty enough to make a joke about it :'(, I'm sorry.
But yesterday I played a ranked game with midlane Heimerdinger, because he's mostly a safe pick for me (otherwise I'd go Karma) and I couldn't tell who their mid was. So Normally you only use his ultimate during the following two scenarios:
RQ - If someone dives you, or if you are getting ganked. It gives you a much stronger chance to survive and win the fight.
RW - It's an assassinate. If you have a clear shot it's like Syndra ulting with 5 orbs.
But I always wondered what the point of RE was since it only does damage once, despite bouncing 3 times. This made me think that it's probably an initiation tool to try to get an AoE stun out. That's probably still true. But it was the first time, in...like a year (and 1 of maybe 20 games in 5 years) that I've had a perfect ranked game. So I clearly outplayed mid Nid, she was too aggressive. But time and time again, I was able to catch her, and others, out with his RE.
After playing with him long enough, and seeing that his RW animation appears further yet never reached the target I was aiming at, I realized that RE actually has more range. And it can't be body blocked by a tank. The damage may be much lower, but it is great for runaways..
Well that was the story. Here's the game in case there are any newcomers to Heim: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1845484824/36980328?tab=overview&participant=3