The Exeo build quality was inferior to the the A4. I drove an A4 for three years and disliked it for other reasons, but not the build quality. Of course, I am only speaking from experience of one Exeo and on A4.
We've got one as dh's company car. It's not exactly exciting but I don't have any problems with it either. It has lots of boot space and dd1 hasn't been car sick in it yet (fingers crossed) so the ride is smooth. As has already been said, good visibility and easy to park. The only negative is that I find the driving seat a bit low and laid back however I try to adjust it.
Maybe have a look at the Skoda Octavia too. Similar price to the Golf estate but bigger. Don't bother with the Seat Exeo though. We had one on long term hire once, and the interior was flimsy and badly built.
DH had one for a couple of years, as a company car. it was a Bluemotion. Very cheap to run, but also v low and used to.bottom out on our unmade road. I think this is just the Bluemotion. As estates go, it is not huge but generally big enough for a family of 4. We used to use a roof bag for holidays. Reliable though.
We have a 10 year old Golf III estate. Not sure from your post if you are looking at the more recent version.
We are very happy with it (had it about 4 years) good solid car, cheap to run, perfectly pleasant to drive, easy to maintain, fairly big boot but not an enormous car. I also find it quite an easy car to park despite being an estate (good visibility). There is absolutely nothing fancy about it, but it is a good reliable comfortable car.