Some questions you may want to consider before deciding are:
How long will you be in Singapore?
How much notice will you be able to give tenants when you need to return?
Will you be using a relocation company?
A good property management company should take care of most of the issues of renting and you should find out up front what services they provide and the cost.
Whatever you decide I would be happy to help you with that, whether it be referring some property management companies or listing your home for sale.