Just flew on EK First on both plane on 2 legs
LAX - DXB on A380
And DXB - SIN on B777
A380 seems to fly smoother than b777 although the weather difference can be the cause.
Suite size, both seems similarly sized,
Wifi, horrible on a380 ... very slow and only useful for text only chat
B777 wifi is waay better
Shower on a380 .... looks like it was a gimmick at first but actually it was very useful.
5 minutes of water is sufficient for me.