The general properties are that VG is somewhat sweet, produces more vapor, and is thicker. It doesn't carry flavor as effectively either. PG produces more throat hit (though nicotine provides most throat hit) and carries flavors well, but doesn't provide as big a cloud.
Some people are sensitive to one or the other, usually PG. Most people have no negative reaction to either, so it is mostly a matter of figuring out what proportion you like best. I don't like sweet flavors, and am more interested in flavor than clouds, so I use at least 70 pg to 30 vg, and now that I am mixing my own it is ending up closer to 80/20.
You should be able to use almost any combination in a Nautilus mini, though if you go 100% VG it might have some problems wicking fast enough. If that is a problem, then you can add a small amount of distilled water to thin it out a little, but most commercial liquids have already done that if it is needed.
And Welcome to ECF!
