As far as I know PV is more durable and easier to clean - but wool has better thermal qualities (especially when wet) and is more breathable. So it really comes down to whether you want to prioritise durability over warmth or visa-versa. As I mentioned previously, if cost is a big factor there are plenty of options with the ex-hire market - but you might need to flexible in terms of your choice of tartan.

All three of these kilts cost less than £200 - all heavyweight tartan two are ex-hire, one is from a kilt-maker who sells pre-made kilts (just happened to be in my clan tartan and size).