After much consideration, i hv decided to switch my IWDA (SCB) to VT (FSMOne RSP). I'm fully aware of the witholding tax and estate tax issue with US ETF, but the cost saving is quite significant.
As I am investing S$800/mth for IWDA/VT, this is my comparison.
1) SCB forex spread = 0.4%, FSMOne forex spread = 0.25%
2) SCB brokerage fees = $10.7 * 4 (batch 3 mths), FSM brokerage fees = $1.07 * 12
3) IWDA witholding tax = 15%, VT witholding tax = 30%. Assuming dividend at 2% pa, the saving from IWDA is 0.3%. (corrected)
4) IWDA TER = 0.2%, VT TER = 0.09%
5) FSMOne has dividend handling fees of $2.5 per dividend. So its $10 per year of dividend loss.
Based on the above number, I use the spreadsheet created by another forummer, VT annual fees is S$43 (include dividend handling fees) vs IWDA S$96 (didn't include opportunity cost).
However, this comparison only applicable to my case.