When should I neuter my male kitty?

I have a 3 months and half male kitten and I am thinking about neutering him when he reaches 6 months but I’m afraid it is too early even if my vet says it’s the right time.

How was your experience with your kitty?how did he cope with the surgery? What are the benefits and disadvantages? Changes?

Please any advice or feedback is welcome

Many thanks🙏🙏🙏