The general convention for pots is that A is an audio/log taper and B is linear.

For smooth control of volume, you should always use an A type audio/log taper pot. Using a linear pot here will give a very sudden volume reduction when going from 10 to 9.

Tone pots are more a personal preference. It is more common for the tone pot to be a B type linear pot, but A type pots work here as well. For a faster tone roll-off, use a B type pot, but if you never really roll the tone back much, but occasionally like to take the edge off the sound, then an A type pot gives you more control at the top end of the tone control - say 10 down to 5. Below that, the tone then gets dull very quickly.