Larger drives within the same family of drives are louder and hotter, it's an unavoidable physical fact. Will the differences be huge? No, not usually. Certainly nothing to affect a buying decision. All drives in a certain family from one manufacturer usually have the same data density throughout, the only thing that changes, is the surface/platter count.
The additional surface count will improve disc performance for a set amount of data. For the simple reason that the more surfaces that are written to, the less distance the read heads have to travel to find the same piece of data. It takes less time to switch read/write heads than it does to perform head seeks. Again, the differences won't be huge, but they will be there.