All the optical sticks will work fine for 8-way games.
Some people don't like the fact that there are no corners on them.
I prefer the completely round sticks myself (leafswitch Wicos, P360s, Supers, etc...).
When you say optical 360, I assume you are meaning the Perfect 360 from Happ.
The P-360 from Happ is just an 8-way stick, and doesn't have the custom mapping ability that the U-360 does.
The U-360 from Ultimarc will let you play everything from analog to 2-way, and custom map the output of the stick, so that only the desired outputs are available.
That means that it won't output a diagonal that will mess up a 4-way game, like the P-360 will.