I always considered that the Puma having two doors was a double-edged sword.
It was far more difficult to control entry/exit than on a Wessex and very easy to be in the "wrong" door.
The load/unload for 12 troops did not seem to be that much quicker and there was double the chance of someone heading towards the tail rotor!
Once you took into account the fixed undercarriage, tailwheel and engine response I felt the Wessex had significant operational advantages in NI, for trooping. (Sorry chaps!)
Also the Puma doors needed careful inspection and use, if they fell-off.....
lsh
(PS there was at least one stick-leader in NI who thought that the Wessex DID have a LH door, there was an anxious face at the bubble window, looking for the door handle!!!)