I'm building an itinerary that includes a stop in DPS.

I'm holding space on CX (a 777), 22-hour layover in HKG, then QF (744) to MEL.

There's also space on SQ in J (SQ247 to SQ237) -- a 772 and a 773.

I've never flown SQ and would love to give it a try -- but are these older planes? Is the 7-hour SIN-MEL a newer configuration? Better to fly that than the CX/QF option?

Thanks in advance from this SQ newbie!