You can do almost anything with any type of Engineering degree, so you won't be limiting your general employment areas just very specific ones; your unlikely to go into the oil industry with an aerospace degree or plane engine design with a chemical degree. Your also not limiting your career abroad prospects, both types of engineers are highly sort after in various places around the world.
Chemical Engineers are meant to be the highest earners of all the Engineering specialisms. However, you will not be badly paid with an Aerospace degree.
Basically all I can say is go with your heart, there is no point doing a degree for 4 years in a specialism you don't like. Though I am not sure about this, I would not be suprised if you are able to change specialism once you've started a course at university, if you find that you do not like the degree.