I have been advised to have silicone oil or gas at the end of surgery . Which is better?

Outcome of surgery is not dependent on either gas or silicone oil as both can achieve same results. Which is best should be left to discretion of the operating surgeon. Only difference is that gas  needs no second surgery as it gets slowly absorbed. To remove silicone oil a second surgery is needed. Its important to AVOID AIR TRAVEL for minimal of 6-8 weeks when gas is used.