Will attending the UAS in University enhance your prospects of becoming a pilot in the RAF?
Unless you are already a good candiate (it's difficult to judge), the UAS will of course help you become part of the RAF.
Firstly, it will help you if you want to go to OASC by preparing you. The officers on the Sqn have experience themselves as they interview potential recruits. They are able to help you through setting up practise interviews for you if you so wish. Often on ground training nights, OASC prep. is the subject for the night - either through discussion exercises, team planning exercises, confidence building techniques (e.g. 5 minute on-the-spot unprepared talks). OASC often tour each UAS every year to give a 'heads up' on selection.
The other way the UAS can help you be successful at OASC is through encouraging you to keep up your fitness and harness the love of current affairs - such as 'In The News' part of MetBrief, which often leads to a discussion on the topic. Team building and leadership tasks are also done in the hangar on camps or outside on specific camps aimed at developing leadership - such as the massive exercise that ESUAS organise in Scotland dubbed as a 'Pre-IOT' exercise.
The other way the UAS can help is through giving you the chance to show YOUR POTENTIAL. Your QFI and boss will write a report on your to send to OASC (the AFCO is not used for applications from a UAS). To get a good report you need to take part, organise and lead. This is where YOU must use YOUR initiative to aim for that good report. You can get brownie points through excelling in your first year (get stuck in, trust me, it works) to enable yourself to be considered for senior roles within the UAS such as the OC i/c Adventurous Trg. To get something good out of it, you must put in the effort.
To be more branch specific - the flying will help your aptitude and introduce you to flying the RAF way through a 'light' EFT course which introduces you to various aspects that you will learn throughout EFT. Having RAF instruction prior to joining up is certainly a big help as you are already used to the style of instruction and what is expected of you flying wise (such as the reading and learning you need to do before each sortie, learning checks etc.).
You will get a lot of help prior to OASC as many over studes will be going through or will have been through so can help you out. Being on a UAS will have introduced you to the lifestyle and what is expected of a JO.
It is easier to write a good report on someone who is well known of the UAS and has a good list of things they have taken part in and organised.