Hi guys I need help, my father has two double-decker public buses(Güleryüz COBRA DD 2005) in Istanbul we want to renew buses due to legal obligation.

We decided to buy Akia Ultra DD and this vehicle has optional transmission options. In the past, we used only ZF, but some guys say the allison transmission is good.
Which transmission do you think would be a better idea?

ZF Ecolife 6AP1600B
Allison T350R
Allison XFE

Please do not give emotional answers, because we will use this bus for 10-12 years. I would appreciate it if you explain your answers with their reasons