In terms of Maximum GVW (Gross Vehicle Weight), Volvo B9TL has
the highest capacity (25,400kg), followed by MAN DD (25,000kg) and
ADL Enviro500 (24,000kg).
In terms of Engine Power, Volvo B9TL uses the least power
(231,167W), followed by MAN DD (235,000W) and ADL Enviro500
(250,000W).
In terms of price, ADL Enviro500 is the cheapest (~S$383,950),
followed by MAN DD (~S$400,000) and Volvo B9TL (~S$545,300).
I choose Volvo B9TL. Although it is the most expensive, it has
the highest capacity and uses the least power.