I’m not going to say 1 grip is better than another. It depends on the individual.
In Europe and probably the States shake hand grip is generally the norm, and what is usually taught by coaches, within the shake hand grip there are also variations, neutral, Bh and Fh positions, some players move thumb to different positions for certain strokes, some don’t, others move index finger around for pushes etc.
Some coaches may actually suggest both grip types and get new starters to try both, I would think these coaches are few though. It would be interesting to see what would happen if both were tried by new starters and they then decided which they preferred!!
There seams to have been a shift over the years towards shake hand grip, this can be seen in the reduction of CNT and Asian players in general using Penhold grip. So that’s what is seen at pro level. As for amateur level, club players etc You would have to ask people from the various countries. But in England shake hand is the ‘norm’ and Penhold the exception. I would even go so far as saying that very ‘individual grips’, those that don’t match either Shake hand or Penhold, may actually be more common that the Penhold grip over here!!!