However much I love Singapore and chilli and fresh crab, I have never "got" chilli crab. In my simple mind if you have a good fresh, expensive tasty crab, the last thing you do is braise it in a hot chilli sauce. You enjoy it's natural crabbiness. Chill crab is disrespectful to crabs and the sacrifice they made and as cycling under underpasses should be made illegal. I think someone invented it to use up whiffy crabs just like someone invented fish in batter to use up whiffy fish.
I get pepper (white or black) crab but not chilli crab.
IMHO
"Chili crab sauce" + fried mantou = friggin' good enough!