I just bought a Raspberry Pi 2B and am now looking at accessories for prototyping some electronics projects. From what I've found, it appears there are three different styles of cobblers that make it easy to attach a Raspberry Pi's GPIO pins to a breadboard:
The standard one, which is nothing more than a straight-through GPIO header you plug into a breadboard, has an obvious practical drawback, in that it puts the GPIO cable potentially in the way when trying to work with the breadboard:
The one that currently seems most popular is the T-cobbler, which moves the GPIO cable out of the way:
There's also a third, U-shaped, cobbler which doesn't seem as popular but provides the same benefit of moving the cable out of the way:
It seems like one could drop an IC or perhaps some custom module in between the two arms of the U-cobbler, but I know nothing at this point so I'm not sure if there is any scenario in which that would be useful, or even advisable--would an IC have an appropriate pinout for connecting to the RPi in this way?
Are there any practical reasons to use a U-cobbler over a T-cobbler or vise-versa, other than price and availability of each part?