Mackie,
If you really want to get into aircraft engineering you have to decide what your interest is. First you must have an interest in aeroplanes or helicopters. Then, if you like fixing mechanical things go for A & C (Airframes and Engines that is) On the other hand, if you prefer tinkering with electrical or electronic bits and pieces go for Avionics. It is a mistake to follow any path only for the money or "prospects" (whatever they are.) You have to like what you are doing or else it becomes a boring grind no matter what it is.
The reason why fewer avionic recruits are coming forward these days is simple. People who like tinkering with electronics have more opportunities elsewhere. When I went into avionics aerospace was the cutting edge for electronics; that is no longer the case. By all means try avionics, (I like it well enough) but only if you are really interested in aircraft first.
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Through difficulties to the cinema