Barbs for me too - really are fool proof
I use the primochill metal ghost ones and they are completely invisable with black tubing and within .4mm of the widest ID available.
But the DD 1/2 fat boys, are the high flow kings (Bitspower, dtek are a close second)
As above 7/16 over 1/2 barbs is a winner - 7/16 is easier to route and kinks less, and 1/2 barbs are as cheap as pie.
The EK barbs are fine - but personally I like the barbs that 'bite' the tube (sharp barb tail)
Cheap compresion fitting can also unscrew them self if you are not careful and twist the tube during instilation.
The larger compression fitting don't fit on every block
The plastic ghost fitting are not compatable with all blocks (a set of wider o'rings will sort that out)
The best I found are the koolance compression fitting. As they have barb tails on the body. Only down side is the retention nut is steel not nickle plated brass