Which is a better NbN shooter

I personally believe that a single flywheel is superior to all the other flywheels. Firstly, a single flywheel is extremely efficient at fielding. Secondly, a double flywheel is a lot more difficult to get 100% accuracy during fielding or full courting. This is due to a number of reasons. The two wheels in a double flywheel will be typically spinning at different speeds. This leads to some funky spin on thew balls. A solution to fix this, is to chain together the two wheels. But again, this leads to even more problems. The chain would be very bulky, and it would lose efficiency.
Thirdly, a double flywheel inherently takes up more room in the robot, creating unnecessary weight and bulkiness. Now for full-courting, a double flywheel may reign superior, due to the inherently easier nature to tune it for full speed, but then you have to compare it to the puncher or catapult. Now a puncher/catapult are typically very accurate full-courting mechanisms.
Therefore, the vast range of abilities from a single flywheel outweighs the few benefits of a double flywheel.

And then there are those asian teams with the best double flywheels ever…

I haven’t heard anything from the 7090s since November. Are they going to worlds?

All three vesibay teams are going to worlds (7090 A,B,C).
http://vexdb.io/teams/view/7090A
http://vexdb.io/teams/view/7090B
http://vexdb.io/teams/view/7090C

No they aren’t.
The worlds that it showed was Tossup.