Alan Shepard hit a one hander on the moon, otherwise two hands on the grip in whatever manner works for you. There are three accepted grips but no where in the rules does it say that you have to use any of them. Time and doctrine has established the big three as accepted.
We use two arms to establish the swing plane and maintain directional control. The right hand and fingers are really what deliver the club to the ball if you are right handed. I like a really loose grip, ideally only the minimal grip to keep the club from flying. When I start my down swing, I want a natural and free release of my wrists towards the ball, for me this happens without thinking and should be like a whip action. I am left handed and when I think in terms of my hands I am more focused on having a sense of my three fingers in my left hand, starting at ring finger towards thumb delivering the club head to the ball.
I prefer interlocking, some of this is about the relationship between your arms shoulders and hands. Interlocking for me promotes a good release with club head control. I like it much better than overlapping. I think I played around once or twice with 10 finger grip and did not like it but I don't remember now. I really value the sensation in the fingers more so than the precise grip.
I really think if you are not confident in your grip you should get some qualified coaching or teaching advice, practice with what you establish and see if it helps.