These two southern Californian cities are about 30 minutes away from one another; both are coastal cities, so beach weddings are very popular with either city. There are sea-side resorts in each town, which are popular venues for weddings and receptions. Santa Barbara and Ventura have a lot in common; both have famous old missions from when Spain colonized the area, there are also botanical gardens, nature walks and parks.
If you’re stuck choosing between the two, it all depends on your personal preference. With both cities so close to one another, you could stay in Ventura, have your wedding booked in Santa Barbara, or vice versa. There is a train that goes back and forth between the two cities, so guests have a convenient way to travel either place.