I would suggest the following differentiation:

• If the keyboard is for typing (long term and not once in a while) you would want to go with an 'optimized' layout like the QWERTY or something else.

• If the keyboard is not optimized for typing with (both) hands, you can debate about going with ABC keyboard.

eg: Satnav are not necessarily in your hands while typing the address, they might be mounted on the windscreen or fixed in the center console. In both cases user cannot use it with 2 hands to make use of the QWERTY optimization.

eg2: In game consoles, you do not have a QWERTY keyboard (usually) and are given a ABC layout for easier access.

I would say that ABC might be easier to use while looking (You navigate the cursor to the key in a 4 direction movement).

I would suggest the following differentiation:

• If the keyboard is for typing (long term and not once in a while) you would want to go with an 'optimized' layout like the QWERTY or something else.

• If the keyboard is not optimized for typing with (both) hands, you can debate about going with ABC keyboard.

eg: Satnav are not necessarily in your hands while typing the address, they might be mounted on the windscreen or fixed in the center console. In both cases user cannot use it with 2 hands to make use of the QWERTY optimization.

eg2: In game consoles, you do not have a QWERTY keyboard (usually) and are given a ABC layout for easier access.

I would say that ABC might be easier to use while looking and selecting(typing).