I remember when I restored my first pump. I restored it to a fire chief as well all because I am a fireman. Now just 5 years later I have a house full of pumps and globes. It strange how this hobby can take over your house. As far as your question I like the 15 it really comes down to a personnel preference. Good luck on your restoration
Always looking for Simpson oil, Super A, and MFA oil cans and globes.