Above is just a general illustration of different coloured fly lines on the market .
It is the line head colour that varies a lot , Olive green ,orange,brown ,grey,black, white ,cream, ice blue, dark blue ,yellow, clear , etc
I reckon the best coloured lines to fish with are white,cream or ice blue, these being the colour of the sky, viewing what the fish sees above in clear or clearing water, Bright orange heads on lines don't appeal to me , as this may spook fish ? ok for running line though ,
Going way back when , only 3 main colours white/cream, green and brown mainly Scientific Anglers lines ?no multi coloured lines as of today
Versi type leaders come mainly in white/cream floating ,,dark green slow sink ,,brown fast sink ,. grey or black extra fast sink colours, I must admit I have never used a floating versi leader, where is the point of that, just use a full floating line .
Also I cannot be done with loop to loop running lines and heads , I only fish with integrated running lines, shame there isn't a decent choice of sink tip lines on the market ?
You can pay as much for some running lines as as a full fly line these days .the fly lines of today are a doddle to cast than the old double taper and WF lines ,