Hey, im a fresher currently living in unsworth, and my boyfriend is a fresher living in Denmark Road. The social life in denmark road is awful - it pretty much doesn't exist. The unsworth social life is much better (because its on the social fallowfield campus anyway). In terms of travel, denmark road is about a 5 minute walk from the uni, whereas Unsworth is about 10-20 minutes on the bus (depends on if its rush hour or not). Buses are incredibly frequent (every 1-2 minutes) and its around 250 pounds a year to use it.
In terms of the actual flats, the unsworth ones are definitely nicer - they opened this september so I was the first to live in my flat - the bedrooms are much bigger and the kitchens are massive (the kitchen is the main selling point of unsworth over others in my opinion - much more social).
Overall, I have had the best 3 months of my life living in unsworth and I know my bf regrets applying to denmark massively, so i'd recommend unsworth. I have more photos of the flats if you would like them, because the university don't have many photos online - if you want them I can post them
ALSO regarding 42 week contracts, you can apply to stay in the Uni halls over summer if you don't want to or can't afford to go home, so don't worry about that.