Training- Bike or peloton

I am just starting the idea of doing a triathlon. I plan to do a sprint first to help get my feet wet. I don’t plan to do one till next year since I’m in school but want to get my training going. I don’t have a bike for myself. I’m wondering if I should go ahead and get a road bike and get the stuff to ride it stationary at home but then of course I can use it on the road when possible; or should I get a peloton (or peloton type bike) for training?