Having experienced both schools, I couldn't advise Tayflite more. At Perth they have a smoother running and professional outfit compared to Dundee. RAF cadets at Tayside run the show and commercial students are hidden away in a portacabin.
With Tayflite, I felt well looked after and I believe because the sister company is ACS, they understand the importance of customer satisfaction. Moreover, Perth is the exam centre for Scotland which makes things run smoothly towards test.
Tayflite would be my school of choice. Good luck with your training!