Its not so much which saddle, but which one is the right size to fit your sit bones and it does make a big difference to comfort and also performance and neither of them have their sizes listed.
I used to ride on a Fizik Arionne, till I got a bike fit and it was found my saddle was too narrow for my sit bones. On film, my hips where rocking from side to side through lack of support. I was recomended a Fizik Alliante instead which is a wider saddle. On fitting it, my hips stopped rocking and made an overall difference to comfort and performance, I suddenly went from doing rides of around 130 miles up to 250+ a day with no discomfort.