First I want to say that your flash images above are quite good for a single on camera flash. That said, I prefer the HDR ones overall.
If I may be permitted some mild criticism, in the flashed image of the bedroom, one light is quite good in that little room. I would prefer it to the HDR if it were not for the shadow behind the ceiling fan. Is that a direct flash? Bouncing it off of the wall behind the camera would probably take the edge off of the shadow. I also like the window pull in the HDR better but that's just a function of SS - a faster shutter would not effect flash but would make the window print darker.
The other room is long and narrow and your flash falls off about 2/3 of the way in. It's quite obvious. You could, perhaps, feather it up a bit or maybe hide a small low power flash behind the sofa. I really think the HDR is your best here.
Hope this is all helpful.
Thanks for the feedback. I do bounce off the ceiling and used to use a Lightsphere diffuser which really helped with the harsh shadows and provided a more even light. Then I read that it's better to shoot without it for some reason. (it does look a little goofy but the results were nice). I understand what you're saying with the living room shot and the light fall-off, what I don't understand is why some people wouldn't just use a grad filter in LR to up the exposure? Or use a brush to brighten it up?
When I do these shoots, I'm not charging that much (over a hundred though) and I don't want to spend a lot of time there. And I really don't want to spend a lot of time in post. I try to get in and out in a half hour or so and spend about an hour in post
EDIT: Just took the image and removed all dodge/burn and just used a grad filter.