OK, so for the purposes of research (and as I was flying Scoot) I burned two Dragonpasses to try T1 SATS and Marhaba. As noted above, it is "sama sama," but with SATS for me having a slight edge due to more comfortable seating in a greater variety of configurations: singles, doubles, quads offering more privacy; whereas Marhaba had mainly quads and sixes in an open layout. A lot of the Marhaba lounge seats had uncomfortably high arm rests with weird wooden covers.
Food: fairly line ball, Marhaba had a couple of nice curries (Japanese beef and Indian gobi) but otherwise fairly uninspiring, SATS has the laksa station which is nice but otherwise their main dishes were very carb heavy (like Qantas J lounges except with more variety). SATS has a bit more variety with cold meats etc.
Drink: the usual suspects, one choice each of white/red (didn't try), limited selection of spirits (self pour) which SATS having a slight edge of Gordons over Beefeaters, and local beers.
The clearing-up trolley at Marhaba was very loud, didn't notice it at SATS.
Both were relatively quiet when I was there, SATS mid-morning to lunchtime, Marhaba breakfast time to mid-morning. SATS may have been busier at breakfast time than Marhaba at the same time, but it was clearing out when I arrived so not sure.
Marhaba armrests:
