What way is it better for me to travel in business class from Adelaide to Moscow.

What way is it better for me to travel in business class from Adelaide to Moscow.Is it by Emirates , Cathay or Singapore Airlines.

I forgot to add Qantas

Nicholas, "better" is too subjective a concept to assess objectively, with respect to flights.

I suggest you make a list of factors that are important for you on a longhaul flight, such as comfort, price, timeliness, etc. then assess each airline according to those factors. 

Nicholas, if all three airlines offer you direct connections from Adelaide through to Moscow via their respective hubs (Dubai, Hong Kong and Singapore) then it'll come down to how you weigh other factors - such as total travel time, duration of the stopover, which frequent flyer scheme you want to earn points with, etc.

Personally I think Cathay has the better business class. Out of Adelaide on Emirates you'll be on a Boeing 777 with a 'sloping sleeper' seat (not a fully-lat bed) and no direct access to the aisle. CX also has a great and recently-refurbished business lounge at Hong Kong (The Wing Business Class). But I've not experienced Emirates' business lounge in Dubai, and again, it could also come down to transit times.

Another factor is earning into local frequent flyer schemes. For example: on Emirates and Cathay you can earn Qantas points, but status credits only on Cathay, unless you book the Emirates flight under Qantas' QF number; on Singapore Airlines you can earn into Virign Australia's Velocity frequent flyer scheme.

So, what are some of the things you're looking for in determining which airline to fly?