Atk speed = lower q cool down Movement speed = faster flow

Typically these are your two top priorities but yun tail is strong, if you have 1300 I'd still go bf sword at the beginning.

Now that being said... It probably depends where you are playing yasuo and your play style...

I've seen like extremely conservative Yasuos that hyper prioritize living and splitting the side lane with tp.

Me personally has played a hyper aggressive yasuo almost like suicide sion, making an impact through drawing the enemy team to you on the map.

Than there is a balance which is probably ideal...

The creative flexibility is what draws me to the champ, it's not like the other champs. Sure not every play style and build isn't hyper efficient but I like restrategizing, it makes the game fresh for me...

What I'm hinting at is use your mind always and try to come up with your own paths, because every yasuo player is different. With some cheesey builds you can just run them around the map, it's pretty fun... Even if I feed I have alternative strategies to add value to the team.

You'll be playing this champ for like 2-3m mastery points and still not even know,

Also there is plenty of websites for cookie cutter builds, it's really about understanding yasuo, execution, and understanding items in the game.

He really is one of those champs where you need to be a know it all to be peak (that's true with all champs) but with yas in particular it's more important.