I have a sister living in Abu Dhabi with her family for the last 10 years, and I have been in Doha for 3 months now. The prices for rent, food, transport, etc are all very comparable actually, and no huge difference. The traffic here probably is less than that of Abu Dhabi; but there isnt much to do in Doha as compared to AD or Dubai in terms of entertainment and fun, so decide wisely.