I am looking to apply for a trainee position at a big European space company. There are around 60 positions available, of which 2 are interesting for me. Unfortunately the company has the policy that only one application can be sent per person. This means that I have to estimate the chance on success for each position I'm interested in and apply for the position with the highest chance.
My question is about estimating this chance.
For one position I fit the requirements well based on my academic background (aerospace engineering).
The other position is in a different field (architecture and civil engineering) However, I've acquired some experience in this field in my graduation project. Additionally I'm more motivated as the described project interests me more than the one for which I'm trained.
Is my chance to get hired as a trainee higher on the position that fits my academic background or on the one where I can provide a better motivation (in the cover letter) and show experience?
Or is this something that is impossible to say as there's no general guideline in hiring trainees?