I've been offered a foundation course in queenmary (for science and engineering path as well) and a direct entry to the psychology to Brunel. I chose queen mary, and since you're asking for people's opinions, I say you choose queen mary as well. It's just 10 mins with the tube to get to central London; and its a campus university. I've visited the campus, and it's beautiful. Also the neighborhood is very nice and friendly. Accommodation is inside or just across the campus, there's Sainsbury's right across the road along with many restaurants and cafes. Its very convenient, and people are very friendly.
it's possible to move on to another university after the foundation year, if you get the required grades.
So I'd say go with queen mary.