I use both. Compression fittings are not compatible with sidr pipe. They are used on CTS pipe. So it's different poly, different style connection. Compressions shouldn't be used in applications like well drop pipes, the can pull apart with enough force.
CTS pipe can be convenient if you need to sleeve inside a failing line. The compression fittings are easier to take apart if it's stuff you disassemble on occasion. There is much more brass to the compression fittings and less brass to water contact, so they last longer with corrosive water or acidic soil.
Ford is one particular brand, they seem popular in Canada, I use a few different brands in my area. The CTS stuff is the standard for municipal supply in my area. Well companies favor sidr and hose barb and get their supplies from pump distributers, commercial piping companies favor CTS poly and compressions andn get their stuff from commercial piping suppliers.
