Personally, I would make the move from Krisflyer to Royal Orchid Plus. Why? Simply one reason, Krisflyer is NOT an attractive frequent flyer programme.

At ROP, you can enjoy your Star Alliance Gold Status for 2 years instead of one year at Krisflyer. Also, you get other perks such as upgrade vouchers and the rest. However, you cannot compare TG's inflight product to that of SQ's in the Star Alliance camp. A totally different product and quality - practically at the opposite end of a spectrum.