Which is the best sci fi anime ?

[MrunalDeole]

Except steins gate and Robotics notes because I have already watched them
and they should not be too long (maximum 50 episode )

 

[NTO]

Steins;Gate

 

[bubblegumpandabear]

Guilty Crown
Stein's gate
Cashern Sins
Eureka seven
Code Geass
Gurrenn Lagann
Cowboy Beepop
Ergo Proxy
Darker than Black (kind of)
Blue Gender
Chobits
Mobile Suit Gindam

 

[Dana1]

I think Cowboy Bebop is a classic