Consider this: recording guitar and vocals simultaniously will give you a very live feel. But you will add some high EQ to the guitar track and so the vocal sound (spill) will get some edgy tone as well, not very nice.
A fig 8 pattern is very sensitive on the front and backside, but almost deaf on de side. Use the fig of 8 on the guitar and aim the side of the mic to your nose. Try this and let us now how it works.
The alchemy of the masters moving molecules of air, we capture by moving particles of iron, so that the poetry of the ancients will echo into the future.