What is better, being an only child or have siblings?

I wanna be a mom in the near future and me and my partner are looking for a house but are not sure if we want only 1 or we decide to have 2. Im an only child and he has a brother much younger that didn't even grow up with him soo we both had more lonely childhoods, that makes us think that have siblings most be amazing but we can't say that without living it soo im trying to find the most common opinion to help me make the best decision.