All the aftermarket control boards are compatible with all the 1/16 armour that we have available today,
The first thing you need to know is how much space inside your tank do you have?
The CLARK board is quite small and will fit inside the hull of a PZ111/PZ4/ShermanM4 the IBU2/3 is a larger board and is more suited to the Tiger1/2/Challenger/Abrams etc,
They are not difficult to set up,
The IBU comes with a decent set of instructions and you can just follow the enclosed illustrations and just put the plugs of the tank into the correct sockets of the control board,
BUT to get the best from an IBU2 you need a computer and an IBU3 is designed around the user (You) programming it from your PC/MAC/Laptop
For sounds and other set up options simply unclip the Micro SD card from the IBU and put it in a micro SD card reader, (Cheap as chips from PC World) and connect the card reader to the PC via a USB Port and just follow the instructions.
Think about it for a minute,
The makers of these boards want people to buy their product and making a control board that requires a degree in electronics will just scare customers away.
There is plenty of help available from Ian at
www.rctankelectronics.com and from Thomas at Elmod plus pages of help on the Forum.