Personally, I love the idea of the VS events, but I think that having them once a year is a bit too long of a wait. I think it should be around 3 times a year, because that would create more lore between characters, and the new skins they would get would be excellent.
I'd love to see if we can vote on who to have in the VS events. It would've been great for a Morgana VS Kayle event when their reworks came out.
Similarly, maybe Riot can release two new champions as a VS event, which would be great!
~Comment on what you think about this!