Your choice of shutter release is sometimes dependent on what you're primarily shooting. Keep in mind that with most wireless releases, there is no "lock" function.
This means that if you're into doing really long exposures, you're going to be either limited to 30 seconds (or whatever your camera's max manual exposure is), or you're going to be sitting in close vicinity to the camera and holding down the button on your remote for the entire exposure while in Bulb mode - which sucks. Having to hold down the button the whole time while atop a 40 storey building in the middle of winter is not fun!
If you're doing long exposures, I'd probably sacrifice the physical convenience of wireless and I'd go with a cabled remote instead, as most cabled remotes have a lock feature so you can set and just leave the camera while it exposes for as long as you want.
Otherwise, the range on most of the IR remotes isn't more than 10 feet or so. If you want a good wireless system, RF is the way to go as some of the better systems have a range of up to 1600 feet or so, and can be fired through obstacles.
Hope this helps!
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