The best country for incorporation depends on your business, imho it doesn't make sense to compare both based on cost as CH and SG have very different nature.
CH doesn't have WHT on interestes and royalties but have a 35% WHT on dividends. You would be able to get money out of CH at 0% WHT with very few selected countries and you have to demonstrate not only that you are the beneficial owner but also that you have substance there. In other words they don't want money to leave CH.
Singapore on the other hand have 0% WHT on dividends even for non treaty countries.
Just this distinction alone could be enough to let you decide what you need most for your business.