I really like the emerald iridium lens,for sunny days with some cloud cover. Pink is good when its overcast but can really burn your eyes once the sun comes out.
I use Blue Iridium - brightest days, but still good if the odd cloud closes in. This is more verastile than black/fire iridium
Emerald Iridium vr28- good all round lens most reached for goggle.
Pink- Cloudy days that may clear later in the day.
Hi-Yellow- when vis is piss poor but theres 30cm of fresh, so its on. hi-Yellow is definately not a verasitle lens though as its SO bright. I dont know how some people wear it on sunny days, it makes me strain my eyes.