I would want Lakeside if I had the choice but it seems to be hugely oversubscribed (the rent's gone from £98 to £115 p/w in 2 years) and it's pot luck as to whether you get in there. Really I think it's down to what you make of it but Lakeside's said to be less social. The rooms are slightly larger there I think and the bathrooms are better but New Build has the better kitchen. New Build is like the Sahara Desert.
Stafford I hear have the best parties but has no ensuite, New build is good also (make sure to go around as many flats as possible during freshers week to get to know people). Lakeside is the least social from what I've seen and when I've been there.