Sooooo yeah?

I think Wukong has a stronger early game with a bit more harass...but Riven can get to be absolutely beastly mid-late game.

Depends on what you need. Wukong provides a great ult and initiate but Riven's mid to late game damage will be higher. Wukong can also build beefier and do decent damage. I think Wukong is more useful personally

wu better since last patch riven nerf

I'd say Riven still. I've used both many times and I excel in 3v3s and in my experience, Riven has ended up working out a lot better. Wukong may be the troll of trolls (in my eyes at least) but Riven becomes completely ridiculous mid to late game. An incredible amount of sustain and once your ult is upgraded once, you completely wreck.

wu kong in an organized group wins fights with his ult

I'd say Wu.
Long time Riven main, as well. Not only did they nerf her, but she just doesn't seem to snowball as hard (even prenerf) in 3v3 since the new map & items.

wu kong has such strong early game

nimbus/auto/Q so much dmg, then you can just clone out of harms way

not to mention pretending to clone juke is fun as hell

riven play style not that fun, just your standard bruiser

wu kong all the way!

Both are very strong. My advice? Have both on your team with a strong AP<<<<<Winning.