At risk of being called conceited, I would propose that ribbon mics are best for recording guitar. The reason is that, close up to the sound source, they give more presence due to a difference in response over coil mics. My favourite is a Beyer M260, but it's historic. About twenty years ago there was a specific condenser mic for guitar which had a sort of rubber tripod to stick it to the front. I think it was made by Kelsey. I thought at the time the man tried to sell me one that it was too clumsy for stage work, but might be good for recording.