There are CA-14 cardioids and omnis. Again, omnis will provide a more natural recording of what your ears hear, while cardioids will focus on the sound in front of them. For concerts, many people here (not me) use cardioids to shut out talking, audience noise, etc. and focus on the stage. But if you are recording yourself and your practice space sounds good, you may prefer omnis.
Useful advice... I'd add that the OP can probably get an idea of whether you like omnis from using the M10 internal mics. If you like the sort of "feel" of those recordings but not the detail, get the CA-14 omnis. If you think, "I'd like to hear more of 'me' and less of the room' then go cardiods.