A:
I have used a slightly older Samsung (about 1 to 2 years old at this point.) The Samsung webapps are way too slow, and seem awkward to use. But it is the slowness that really bothers me. I am not sure if this is improved in later years. The Best Buy salesman was telling me that some TVs have duel to quad core processors, but I am not sure how accurate that information was. If you look at the Samsung in person, see if you can "click around" the Samsung to see if it is slow to load.
The Sony I have to say is phenomenal with their webapps. I didn't buy this TV for that feature, and just think of it as a gimmick. Now that I own the Sony, I use these all the time. I ended up actually getting a subscription to Netflix just because it is so easy and fun to use on the Sony. (and the picture quality is excellent, but the Samsung is probably equivalent in quality.)
The Sony does have a hub type functionality as well.