It is only better in Qatar if your combine income more than what you guys earn in Singapore.

Also consider that your employer will not contribute to any CPF in Qatar.

And ... make sure your employer giving you a house not paying you an allowance.

Met thinks Singapore have more places to go. You can take a bus to go to KL or cross to Bintan / Batam. In Qatar you would see only desert ... and to leave the country you have to take flight which is not cheap.

Of course car here cheaper than Singapore ... you dont have to pay any COE ... no parking no taxes and petrol cost to nothing.

All the best with the decision.