Who's decision is the tire choice? Is it the team mechanic, the riders or the sponsor? If the teams have multiple offerings within a single sponsor, why would they select one tire type over the other?
As a tubeless (MTB only), track/TT (tubular) and road rider, I choose to ride clinchers on my road bike wheels. Butyl for training, latex for racing.
__________________
"Your beauty is an aeroplane;
so high, my heart cannot bear the strain." -A.C. Jobim, Triste