From a mom's point of view, all the comments above are pratical and some things to take into consideration, but the first and most important place to start is to ask yourself why do both? You are pretty positive that you will make both teams, but why say yes to both? What are the benefits?
Some things to consider in your decision making.....Absolutely yes, you can do both and many do, but at what cost. What part does your education play in this decision?....lastly after you've answered all these questions here's something else to think about....
Your senior year....you can basically do anything you want, because hopefully by the beginning of the school year you are working on your college applications in which case most schools will make their decision based on your marks/grades through 11th grade....so my advice is to focus on school now and you have your senior year to play. So think about which one means the most to you now and try to choose one and then go crazy your senior year...JMO, but I hope you find this information helpful....