I'd say choose the morning arrival (EK 203). Honestly it's refreshing landing in the morning, the cabin is quieter, the lines at immigration are short, and the onboard bar isn't too crowded.

The afternoon arrival (EK 201) is alright, but expect longer lines.

FYI the evening arrival (EK 205) stops in Milan, and you have the leave the aircraft and board again, so I wouldn't recommend it (unless you want to do a stopover for a day or two and visit Italy or Switzerland of course!).