From my personal experience with both, I'd not hesitate a second and go with EK
I usually get flamed for saying so, but my (admittedly limited) experience on SQ
in 2002) was service and comfort on the level of what I'd expect from a low cost carrier, but certainly not a premium airline.
My (also not huge amount of) experience with EK
on the other hand (DUS
in 2007, there's a trip report available about that one...
...) was far better, even not counting the three segments we didn't get upgraded to C-class.
, you could end up on a B777-300ER and an A340-500 in one trip...
... then again, if you route yourself through SYD
on the out- or inbound leg, you might be able to take the A380 from SIN
Have fun planning...