I asked some similar questions but they were different enough that I started another thread.
http://www.frequentflyer.com.au/com...t-flyer-programs/asian-ff-programs-12718.html
Having been a Krisflyer Gold member for more than a year I can confirm that SQ gives no more respect to its gold members who fly economy than it gives to other star alliance gold members. They have separate check-in and separate longes in Singapore etc etc such that there is no advantage in putting the miles through the SQ program compared to UA or TG.
All of the SQ kudos and goodies are based on their PPS program and they changed this a few years back so that there is no way to qualify travelling in economy.
I think I am going to have a closer look at TG although their scheduling does not look very convenient.