It's entirely up to you. I know it sounds glib, but if you're a newcomer to plumbing, then either will do, although you'll find pushfit far easier to work with.
Pushfit, if properly fitted, will not leak or come loose, which can not be said for compressionfit.
Cut pipe, (deburr, clean thoroughly with wirewool if copper) mark if needed, and pop the joint on.
Since I started using pushfit with full metal ring, never had a leak.
Pretty much the same as any pushfit. The only problem with using them (as with using hep fittings) is that once they're on, you'll find it hard to remove. Which is a bit of a pain if you need to adjust something.
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