raw is damn xiong on my cards and hdd.... so i wack jpg and hope i get it right, the first time. if not check, adjust, shoot and aim to get it right the 2nd time.
with flash on, its damn hard to use awb i imo. it will give yellowish tone as awb with flash = flash wb. which will make all yellow light very yellow.
depending what you want, you will need to balance your flash with your ambient.
eg, you want your background to be dark/darker than usual (~2 or more stops under, with flash filling in). then you probably not need to spend the effort balancing your flash with ambient coz you're not seeing much of the ambient anyway. awb works.
otherwise if you're shooting at 1stop under (or less) with flash filling in. you need to balance your flash light to make everything more consistant. (eg slap on a 1/2 cto or full cto) Depending on the ambient (moving from 1 room to another, subject standing under lamp/away from lamp) will yield different wb. Thus there is a need to adjust before/between every image. (luckily, they all fall within a small range)
edit: i learnt this from a videographer a few weeks ago. BYOL. Bring your own light. Bring a strong 1/2ct video light and plant it in a area you want to light to provide more "Ambient" light.
custom kelvins works best. for hotel indoors, a 1/2 cto + wb between 2900~4000 works. (of if you are lazy, slap on a full cto, and keep wb on tungstern). Do take note of spotlights though. they are usually white and will throw your wb(and sometimes exposure) off. ask before hand if there will be spot lights.