It really doenst matter what kind of sight you use, it isnt even just a handgun issue, if your outdoors, at some point, the sun will be an issue, and can (actually its a "will at some point") cause problems seeing and/or using your sights, as well as other effects on bullet impact due to it. Its not just being able to see the sights, but also how the sun (or the varying degrees of lack of it) can make your sights "look", even when they appear to be perfectly clear and visible, and well lit.
Another issue here is, EVERYTHING is a compromise, you have to pick the one that will most likely suit YOUR needs the best.
that's one of the downside to 3-dot sights...people look for them.
I'm one of those people, have been since they first showed up. I'm so used to looking for the dots, that I actually have to shift focus to get a traditional sight picture. I see and act on the dots first. For me, there has been nothing faster that works as well, with less or no thought, at all reasonable ranges.
I well understand the traditional blade type sight picture, and use it when its appropriate, for specific types of shooting. I also understand the thoughts behind the big dots and some of the others too. I've tried a lot of them myself, always looking for that little extra. But for me, nothing has worked as well, across the whole spectrum of probable possibilities, as the lit three dots. Are they perfect, of course not, and neither are any of the others.
The key thing is, choose the best compromise, and what works best in the "most" situations. That, and shooting in as many of them as possible in practice, so you know where there may be weak spots and you wont be surprised when they may occur.
