I was in your shoes, albeit nearly 30 years ago and went the commissioned route and do not regret it. Going airborne technician could be fun for a while but its not a long term career unless you want to stay in until 55, an engineering commission will open a lot of career doors for you when you leave, there is also the pension to consider. I did a J Eng O tour and PT job and it was the PT job that formed the bulk of my CV on leaving. It's a personal choice though and I wish you well.