Well it's good to know somebody else is like me
Considering I haven't myself decided between the two yet, I'm not the best person to answer, but the main questions I'm asking myself is, would I rather control the aesthetics of a building, or to make things work using maths, logic, and creative thinking? There is an overlap between the two fields, but you can guess which one uses one more.
Also, have you reviewed the types of engineering there are, and which would possibly appeal to you?
Have you done any work experience, or could you do any, which would help you decide?
Do you prefer studying product design, or the maths/sciences?
Which are you better at?
Could you possibly visit university taster days for the relevant degrees?
& perhaps speaking to people studying these degrees at university is a good start.
The question, ''which one is better'' depends on you; you need to weigh up the course contents, understand what is involved in each degree, and then decide, using your current experience of your A level subjects, which one will suit you better, and which one you enjoy.