I know it's just getting into summer, but I'm trying to think longterm and plan ahead. Which is better a trainer or a stationary bike?

I don't have a lot of money so I wouldn't be able to get an expensive trainer and I'm new to the sport anyways so just something to keep me spinning. Do you have to take the back wheel apart to put your bike on a trainer?

Would I get the same benefits of riding on a stationary bike?

Sorry if I seem completely clueless.

Thanks!