Which diamond setting is best look and secure for round diamond Solitaire Setting, 4 or 6 prongs?

I was told by my jeweler that a 6 prong white gold (shows off the diamond better than yellow gold regardless of the gold color in the rest of the setting) is safest because if you have a 4 prong and one of the prongs is lose, you have a bigger chance of losing the entire diamond out of the remaining 3 prongs.

Kittie

Round Diamond Solitaire
Round Diamond Solitaire
Round Diamond Solitaire