While I am neither a nurse nor a speech pathologist, I have very close friends who are each and can attest to their experiences. To start, both are very worthwhile professions and provide a great healthcare service to the public. With nursing, you will be working more intensive, sporadic hours. Depending on your specialty, you will likely have long shifts with some off days mixed in. You will be treating the sick and injured which can be challenging, but very rewarding. The nurses I know well love their jobs because they have true passion and dedication to healthcare and can roll through the bad days.
With SLP, your hours will be a tad more set and the actual work isn't as intensive or invasive. You could also take the next step from an SLP to be an Audiologist. With this role you would have a Dr. title and could choose to work with adults and pediatrics in either a hospital or clinical setting.
Again, both professions are worthwhile, you just need to decide where your passion resides.