Different kayak paddle blades will have different effects on control you have over your kayak.The blades of your kayak paddles are most important part when it comes to worry about whether or not you'll be able to control kayak. This part of paddle effects how much water you can push with each stroke as well as how paddle will be able to move through water. You generally want a good balance between amount of force you get with each stroke and how easy it is for paddle to move through water.
There are two main types of paddle blades: symmetrical and asymmetrical. The type of paddle that you use will generally have something to do with type of kayaking you're intending on doing. Usually for people who are going kayak touring, asymmetrical paddles are norm. This is due to fact that asymmetrical shape can help give you more control over kayak - and makes it easier for paddle to just move through water.
Another thing that you should look at when you're trying to decide what type of paddle blades will work best for you are whether or not they are curved. If you're a beginner, then you'll probably want to start out with a flatter blade. This is due to fact that these blades are very easy to control even if you're just starting out. However, if you're an experienced kayaker, then you might want to look into getting a curved blade. This is due to fact that curved blades will grip water better and give you more power.