In the films and video games, lightsaber users typically default to something like a plow/longpoint/seigan. I don't think these are the worst possible stance, but are really focused on things a lightsaber doesn't really need (lightsabers need relatively little speed/force to do serious damage) and leaves a lot of the body open to blasters.
I think something like saber's outside half-hanging guard would actually be the default for anyone who expects to fight blasters instead of other sabers (basically everyone post-Russan). It lets the user cover a very large portion of their body with ease just by shoulder movements (only very bottom of the feet aren't protected here, and those are a pretty poor blaster target as is). It allows advancing quickly with relatively little loss in coverage and for someone like Kyle Katarn, it allows quickly drawing a blaster and shooting people who are overly focused on your saber.
How do you think saber combat ought to do differently than it's normally depicted?