I worked with a heating engineer replacing my daughters CH. He used push fit on the ground floor buried in the screed. Then for upstairs it was soldered copper.
in my own home I am virtually all push fit on copper for my CH and plastic for the bathroom.
Plastic fittings are ugly for sure and an experienced plumber will invariably use soldered copper where cost/time allows and/or if the pipework will subsequently be inaccessible.
That being said, plastic and push fit is now the modern alternative material and advances in manufacturing and makeup makes it a perfectly acceptable system to use these days, especially where heat is to avoided and it makes installation much quicker, easier and invariably cheaper.
I will always use soldered copper where I can but sometime plastic can be used to get by difficult situations.
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