The wikipedia page for Barbu (https://en.wikipedia.org/wiki/Barbu_(card_game)#Preliminaries) states:
The declarer names each one of the contracts once. After this declarer has played all seven contracts, the roles of declarer and dealer pass to the left for the next seven hands, and so on, until all have done their seven contracts.
However, my game group has always passed the declaring of the contract to the next player after each hand, while still observing the "each player calls each contract only once" rule. We feel this choice keeps the game more interesting without materially altering the rules of the game. Wikipedia call this variant "Quick Rotation Barbu".
What is the usual practice? Do others see an advantage to each player calling 7 contracts in a row and passing the declaring only once?