I dunno, we share both cars. We had a 2008 nissan quest until last weekend, and still have a 1998 Civic, (we're looking for another car right now), but technically the civic is in my name (i paid for it) and the nissan quest was in her name (she paid for it), yet I drove the quest 85% of the time and she drove the civic 85% of the time, it just worked out that way because I could get the kids to school easier/pick them up, etc, versus her, and she had a longer commute...
so yeah, we had our 'own' cars per say, but we didn't drive them that much, it depended on the day, but usually i drove her car and she drove my car, what does it matter?