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Personally I currently like pex piping cheaper than copper and easier to install.
From my perspective PEX is a million times better as there is more margin for error drilling the centre of a joist rather than notching the top/bottom. Also means it's less likely that some clown will put a nail / screw through it. Therefore I won't have to waist my time putting someone else's fuck right.
What you are talking about is soft soldering, it is easy when you get the knack. Make sure both surfaces are clean and shine, then heat the joint.
Personally I currently like pex piping cheaper than copper and easier to install.