Hi Dave,
Mine was transperineal, I don't think I was given the choice. I can say that it was a very interesting and surreal experience. It could, of course be the ultimate humiliation for a man, that's the worry, having nice lady nurses and doc playing the golden shot with your never regions BUT, BUT they do this all the time and they do their best to put you at ease. And, I wonder as you are up there in Scotland, whether they might let you wear your sporran to help you cover up your bits! Seriously though, I liken the experience as being almost like going to the dentist for a filling. In short, if/when I have to have it done again although not something I would relish or look forward to, it wouldn't actually be anything that I'd worry about (but I might invest in a sporran if I have to go again).
Good luck
Spongebob