Interesting article about pandan cakes in Singapore:
http://www.soshiok.com/article/12221
From my experience thus far:
Prima Deli: ok cake, though not sure I like how moist it is even though this seems to be a desired trait (as they have a "extra moist" label on it).
Bengawan Solo: didn't like their pandan cake so won't be back again. Way too moist, but at least it was unevenly moist. So I cut the cake in half... albeit horizontally and not vertically, and then ate the top half of the cake only.
Asia Bakes: closed down earlier this month it seems so very unlucky to miss out on giving it a try as it appeared to be one of the best places in Singapore.
Yummi Chiffon: this is your low-fat/sugar alternative but I've taken a liking to it due to this reason. Plus they use shredded coconut bits to give the cake a unique taste.
Pine Garden's: this still has to go down as my favourite and I am so eager to pop over and pick up an entire cake for the first time. Unfortunately they are closed for the New Year and will reopen on Feb 1, so I've still got a few days to go.