I've done both. Lately I've been using parallel bracing (tone bars) because I've been putting pickups in them, and I like the extra strength they provide when I have to route the top for a pickup.
But I have done x-bracing. It was on my first guitar though, and after having gained more experience I know that I carved the top way too thickly on it, so I can't really give a legitimate comparison as to how x-bracing and parallel bracing compare sonically. I'd trust Benedetto's description.
Have you decided how you'll brace yours?
Do you have some of the smaller finger planes? I only have the largest (47mm body, 18mm blade) and sometimes I have trouble getting in really far down in the waist area and usually do the last littlbe bit with scrapers. I'm thinking of picking up one of the smaller planes though.