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The two times I have done it via SIN on SQ what you call a "refresher stop" has been a mad scramble between gates to catch the next leg. With carry-ons and security checks it's not worth the hassle (and the interruption in what could be an extended sleep). I would go for a direct flight - and have a bias towards CX for consistency of service - though QF380 has a nice homey feel, if you get a good cabin crew team.