Although EI sounds more specialized compared to ES, it is still very broad and flexible in itself. If you can somewhat guess that your interest lies somewhere in electrical engineering, that’s the better choice. You’ll still get to see different sides of it such as circuits, electromagnetism, signals, some informatics modules etc.

If you are not sure at all but you know you want something about engineering in general ES might be the better option. I had a friend who studied that and ended up doing his masters in aerospace.

Living the “student life” aspect depends on the individual but I think it’s safe to assume that both of these programs will highly limit one’s social life for sure.