The smell I dont mind, been around billys before so I know they can be super gross. When I started to consider having them wethered I did research and while there where no health risks in not doing it there where some pretty major ones when castrating especially young ones.
Having it done when...
I decided to leave the guys alone and not wether them. If they start to fight or get aggressive down the road I will have them castrated but for now the health benefits where greater leaving them be.
So far so good they are still sweet to me and only play with each other.