Unless you are a part of the wedding industry you may not know the difference between a wedding planner and a wedding designer. And yes they are different.
I watch a lot of HGTV so I am going to explain this in house terms. :) A Wedding Designer is the artichect of your home. They are the ones that figure out functionality, flow and design of the home. They choose colors and decor and make everything beautiful and flow well for your wedding guess. A wedding designer helps you design floral, choose linen and helps you design your wedding invitations so everything flows correctly.
A wedding planner is the contractor they keep the planning on time and make sure that everyone is doing what they are supposed to. They help you with your budget, finding vendors and keep your wedding timeline for you.
Do you need both? It depends on the depth of your wedding and then you have those wedding planners that can do both. There are some times when you will really need a wedding designer AND a wedding planner. An example is that you have a large wedding 150+ and you want your wedding day to knock their socks off.
And then there are times when you will just need a designer - you want to bring your pintrest board to life or you are having a smaller wedding and may not need the planner, but want all of the fantastic design aspects.
We do recommend, and yes, I know we are biased that you ALWAYS have a wedding planner. I know wedding planners can be expensive, but someone there to manage your event the day of is priceless.