Which are the most compelling and cost-efficient stock ETFs for Singapore-based investors and why?

Personally, i dont find Sg based ETF attractive. But here you go. For your own reference:

ER= expense ratio. Info extract from yahoo finance

STI ETF
ES3.SI- (ER 0.3%), (Yield~ 4.62%)
CFA.SI- (ER 0.6%), (Yield~ 4.09%)

REIT ETF
CLR - (ER 0.6%), (Yield ~ 4.66%)
BYJ - (ER 1.8%), (Yield ~ 3.27%)

BOND ETF
A35.SI- (ER 0.26%), (Yield~1.98%)