My opinions on grip change as my knowledge of the swing increases. It is a very random thing in my opinion and there is no right way to grip it per se.
At this point I am of the opinion the right hand grip is more important, as getting the right arm in proper position at address, the top and transition is so important.
When the right hand grip is too weak…or weak at all, the right arm starts out of position and wants to fly away from the body on the downswing.
As a starting point, with wiggle room in either direction to fit anatomical or range of motion issues, I like to start with the right hand first, so the line between thumb and forefinger go up the right arm.
Then put the left hand on so the left thumb wedges in between the pads of the right hand,
So far, I have not seen this grip create any issues.