I bottle with both bottles and PET - I have to say, I have never had an infection (touch wood) , never had a bottle bomb, and haven't noticed a flavour profile difference when bottling either. None of my brews hang around for the long haul (10 months +). I think you can use either without issue. I have been using the same PET bottles for 5 years and they are still going with original caps.
I will probably move to kegging this year, because it is part of the hobby and I want to, and so I don't have to worry about pouring a jug each night rather i can just pull a tap and if I don't want another full tallie, no biggie I can take a half.
Apart from this, I have never had an issue with them. When I was starting out with my first few kits, I had a few gushers while learning, and I am sure they would have been a risk if it wasn't for the PET.
My 5 cents cause you can't get 2 anymore.