16:9 better FOV for gaming:
Usually, yes. Apparently most (not sure what percentage) modern games, especially FPS, are indeed HOR+. But for older games (mostly pre-2005) and especially old console emulators (which are always 4:3), 16:10 is miles better than 16:9. But if you're concerned with HOR+, then you should be going for a 21:9 monitor, while you're at it.
Furthermore, if you're looking at the 24" range for example, then the 16:10 monitors are usually 24.1", whereas 16:9 monitors are 23.6", even if they're both advertised as 24" (or at least it used to be so, you'd have to check before buying). And while this is only a difference of half an inch, look how it stacks up:
http://displaywars.com/24,1-inch-16x10-vs-23,6-inch-16x9
In other words, you can get, even with black borders, pretty much the same viewable area displaying a 1920x1080 image on the 24.1" 16:10, like you would get from a 23.6" 16:9 using the whole area. And they have pretty much identical pixel pitch, too. (about 0.6% difference, if my calculations are correct)
But the common downside comes from the fact that 16:10 usually brings a price premium. Though they're usually better quality monitors, too. In addition to being slightly bigger in size. On the other hand, if you can find similarly priced (and featured) 16:10 and 16:9 monitors on the same size category, then 16:10 should definitely be the better choice.
And indeed, this is even without into taking account the superiority of its desktop benefits.
But in any case, if you're concerned with HOR+ games, then I would suggest you go for a 21:9 monitor. Otherwise, 16:10 is better, but also pricier (at least usually).