Depends what mood I'm in/why i'm playing. Typically I'll pick:
- A champ that looks fun/enjoyed previously if I'm with friends and/or bored of my typical picks.
- A champ I like that is Lv5/6 and want to get to Lv 6/7
- A champ that a good all-rounder when in ranked (or in practising for ranked).
However, when I pick a champion to play, while being fun is important, I would admit that I find the current power level of that champion to be quite important. However, I prefer to shy away from whatever champions I see lots of in my current games, I've never played Yasuo, Lee Sin or Zed in normals, while I could see myself learning their mechanics ok, they all revolve around deleting someone in seconds, and combined with their notorious reputations, it puts me off (as a mid lane mage main, I prefer working up to the deleting stage in the later game, as I've always hated being destroyed in the early game, this probably influenced my dislike of these champs who typically end up being meta).
However, I do enjoy picking champs that are strong but aren't played much of my games. When Orianna's dark star skin released, I was frantic to try it out, so I thought I would see more competition for mid lane in Blinds, some Orianna instalockers taking her support maybe. Nope. And I only ever played against 1 other Dark Star Orianna since. So even though she's meta and common in LCS, she's definitely more uncommon than seeing Ahri, Lux or Veigar, which I like when it comes to playing Orianna.
A more extreme case than this was when I looked into playing Taliyah. I've already got Aurelion Sol to Lv5 (I would like to play him a bit more too considering i'm getting less assassin match ups), and Taliyah was the "other" new mid laner on the block that people don't play. It was just so refreshing to win games using a champion I hadn't really seen much of before, but can still be so damn powerful. I didn't expect what Taliyah could do, and I'm guessing my teammates and opponents didn't either, which only made things more fun. I would definitely say if Taliyah was stupidly common, I wouldn't enjoy playing her so much, when you bring an uncommon champion like Taliyah or Aurelion into a game, you're changing up the flow of things, you're making your team and your opponents think, you're making the game different to all those repeated Yasuo matchups. This is a big part of why I pick what I do when in that champ select.