No, a full face mask (FFM) does not change the fact that you have to equilize your ears and sinus cavities. The full face window type FFMs have to have a device to allow you to block your nose to do so. That would be the AGA, OTS and Ocean Reef Space. Other masks like the Scupa Pro, Kirby Morgan and the old Cressi have a soft nose pocket that you can squeeze your nose in just like a standard scuba mask.
As far as masks to stay away from, I don't particularly like the design of the Cressi or the ScuaPro masks. Thay seem too much like modified WWII gas masks.
Pros and Cons of different masks:
In general a FFM offers more warmth because your face is protected from conduction by the water.
It is less likely that one would died of drownding in a FFM, you will just sufficate, but you can be revived on the surface and not have the after effects caused by drownding.
If you have a caterpiller under your nose, like me, they offer a leak tight seal around the face, where a standard scuba mask might leak a lot (that is one of the reasons I dive FFM).
Most FFM offer the option of adding and using voice communications (for a price).
OTS, AGA, Ocen Reef masks:
You can breath ambient air on the surface if you get one with the special valve on the face plate that opens to the outside air.
They are design to be self de-fogging by how to air blows in to the mask.
These designs tend to fit smaller faces.
Most people must have the nose block device installed and adjusted to fit them, and it has to be readjusted if someone else uses the mask. I have never found the little neoprene blocks to work for me as a nose block.
You have to use the regulator that they come with.
You should carry a spare scuba mask in case you have to switch to your secondary air source.
You have to remove the mask to talk clearly on the surface.
They can cause you air consumption rate to increase.
Due to the design they have more dead space that excess Carbon Dioxide can build up in.
You can't switch gas mixes without using some sort of plumbing and valve system.
Cressi and Scuba Pro masks:
They are the least expensive.
You can probably use your own regulator that you currently have.
The lenses have to be de-fogged like a standard scuba mask.
They are not very robust, look like a modified gas mask.
Have the largest dead space of any of the FFM on the market.
No oral nasal in mask means air consumption is probably the highest.
Do not come with a regulator.
You must remove the mask to go to your secondary air source, so you should carry a back up scuba mask.
Must remove the mask to breath the ambient air or talk on the surface.
Is not designed to accept voice communications systems.
The Kirby Morgan M48 mask:
Has a pod that the regulator is attached to that you can remove, switch.
You pop the pod off to breath or talk on the surface.
You can switch gas mixes by poping off one pod and poping on a pod attached to your next mix.
You can probably use your own regulator with this mask or buy it with a Kirby Morgan regulator installed.
To go to your secondary air source or buddy breath you simply pop the pod off and stick a regulator in your mouth, the rest of the mask stays in place and you can still see. No spare mask necessary (except if you smash your face into a solid object, thus shaddering the face plate and smashing your nose, jaw, cheak bones and forehead).
It has ports for voice communications systems.
If set up in standard configuration it has a scuba mouth peice inside that you breath through. This reduces Carbon Dioxide buildup in the mask, and it allows you to continue to breath if the mask should flood.
Mask has a nose pocket like a standard scuba mask making it sinple to equalize your ears.
Might not fit smaller faces as well.
Some people say it is not as soft and can be uncomfortable (I have not noticed it to be).
It is higher priced, but comprable to the AGA, OTS and Ocean Reef masks.
It is a little harder to find because it is not marketed as well as the other brands.
That's all I can think of at the moment.
