Huh.
I've had multiple relationships with both introverts and extroverts, and there's a great deal to be gained from either. All have been with intuiters though, save one very short lived relationship with an ISTP.
Generally, relationships with extroverts tend to be far more stressful, but also generate far more personal growth. They really push on your boundaries and force you to learn to compromise in healthy ways, speak up, establish personal boundaries, and all kinds of awesome things that are healthy for introverts to learn. However, there's certainly nothing restful about them. In every extrovert/introvert relationship I've been a part of, there's always a subtle feeling that I'm expected to be something that I'm not -- should be more involved, more communicative, enjoy talking more, etc etc. All of that is excellent learning material too.
Relationships with introverted intuiters are the opposite. They're very restful and tend to become a place to recharge from other life stressors. They haven't offered many opportunities for growth though, but they can lend you the strength to challenge yourself more significantly in other areas of life.
Think it's best to just evaluate what role you want a relationship to have in your life at any given moment. If you want to stretch yourself and become a more rounded person, get with someone with an opposite social preference and do your best to get through it -- you'll learn a lot. If you want a sanctuary and a place to rest because you're getting enough challenge/growth from other elements in your life (career/friendships/etc) then get with someone who is more in tune with your default mode of operating.