Love this question's where everyone who shoots a gun can provide input. Here is mine having used, white dot, GoldB, green and red FO extensively.
FOR ME (I make no claim's what works for anyone else):
I think white dot and GB make great all-round sights, especially for a SD gun. I find both WD and GB approximately on par with each other in this regard (granted, the GB looks nicer and is more trendy in the sense you generally find them more on expensive rather that cheaper priced gun's).
For pure speed, Fiber can't be beat in most lighting condition's (except in low light where GB/WD is better). BUT, with too bright of a sunny day, FO has the disadvantage with precision/long-shots as the top of the front post get's washed out with glare from the FO (GB does this also but to a much lesser extent. WD is probably the best here short of a plain black post). This can be mitigated (not eliminated) by using a narrower diameter FO and/or some limited method on the FO. These are usually called "competition" sights and they do help a lot. Red vs Green, user's choice, I find green is a little less glarry on a sunny day, but it can get loss in background foliage during target transition if you shoot on the edge of a forest like my club is set up.
Everything has trade-off's. But generally, I like WD (plastic gun's) and GB (fancy guns) for SD/short-slide type gun's and The Competition-version-FO sights for range/full slide guns. Of course this is a general statement as I require and use all my gun's to work for both SD and Range/competition.
I prefer the C-FO these day's as inspired by the "latest" IDPA rules tightening up the accuracy requirement's. Not to say you can't do this at SD ranges with the normal FO (one certainly can), but out at 25Y shooting at an 8" plate rack on a very-sunny day in summer, the C-FO makes a difference (and even more at 50 yards).