I know that push fit plumbing systems are disliked by some people but Ive not had any issues so far. I didnt want to start a war just some useage advice.
Sounds like either type will be ok and caveat on speedfit is to use collet clips to deter any tamperings from kids etc.
I am always very careful and use wheel cutters, new pipe etc.
Surely pushfit cant be that bad. Ive just bought a shower pump that had speedfit built in and most new builds seem to use it throughout from the riser upwards.
Talking to a chap from speedfit technical a while back, I quizzed him about failures etc. He mentioned that the issue is mainly with professionals rushing the job and not taking due care and attention.
Years ago I used to use compression fittings and they can be a pain, sometimes weeping, boss paste etc. Then trying to do soldered joints without dry pipes etc.
I have never used cuprofit but it looks tamper proof and a bit neater maybe. Speedfit on the other hand always seems to create a very secure joint.
Matthew