Personally I can't stand hooded front sights. My MI sights I used to run on my AR had a hooded front. They were on a railed block too. My complaint is that if your elevation doesn't land your front sight post in the center of that hood, you will not instinctively put the front sight post in the center of the rear sight. Instead you will line the ghost ring up with the hood of the front sight, and they actual post will not be in the center. If you're just going to shoot from the bench without stress it will be fine, but it makes it tough to snap the gun to your shoulder and put that post in the center of the rear sight. With the hooded sights you will tend to align the circles instead of centering the post in the rear sight.
IMO railed blocks are a PITA. You have to make sure you get one that is the same plane as the receiver. Most are not. Otherwise you have to get taller front sights to level it up. After floating my rifle, I don't think I could ever go back to having an exposed gas block. My hand typically sits right where the gas block of a midlength gas system sits. This equals burns without a float Plus I think the railed blocks are ugly But that is just person taste.