PEX and brass compression fittings

I'd say plastic fittings are far better on plastic pipe than compression fittings.
I've undone a compression fitting from a plastic pipe before and seen the (brass) olive had cut quite deeply into the pipe, I'd also guess that brass olives are more likely to cut the pipe than copper ones.

I'd like to know too. Should I stop dicking around with copper? After all these years I've _just_ started to feel more comfortable with copper and now I've got to learn something new...  . Maybe on my next project I'll install some wavy plastic pipes...

I first used plastic in 1986, it was called acorn then and a lot of it is still in use so, It has stood the test of time, I've seen copper pin hole and plastic go brittle when it was used in plaster, So if you follow the rules, it will last, Hep20 give a 50 year warrantee but John Guest only gives 25 years, I have no fear of useing plastic, but because of my age and training I still prefer copper, copper has a nice feel and looks good and easier to get a neat job, plastic is ok when its hidden but ugly on show,

I used to say "if you're gonna do it proper then do it in copper" then the company I now work for are against soldering and had a rep in to show us Tec tight pipe and fittings, fook me, it's so easy to use, so I've moved with the times. If it's surface mounted I use copper, the Tec tight pipe has a metal layer through it. With regards to brass olives I sling em and use copper ones,never had any problems,mate👍

I generally use pushfit on plastic but, compression is handy at times too, I use what works for me, whats in the bag, i won't rush off to the merchants for a pushfit if a compression is at hand, they all work and have a place in our industry,

In the early days when the manufactures wanted us to switch to plastic, they did courses and i attended one, they built a plasic circuit of plastic pipe with elbows, tees and couplings and pressurized it with a pump, The lecturer asked to take a guess at what pressure we would get a leak, My guess was 100 PSI, the highest guess was 500 PSI, so the lecturer took it right up to 9099 PSI and said, " we are in the danger zone now, the weak spot is a fitting, one of these fittings will crack at 1000 PSI, not a rubber but the plastic" and sure enough, thats what happened,

that gave me some confidence but, It still took a long time for me to put plastic in my jobs, I think it was about 2004 when site work went plastic and I had no choice, it then became a health and safety measure about plumbers notching joists without safety nets,