Which PIC TIMER is best for PWM

Hi,
I want to convert a digital signal to PWM on an 18LF4520 PIC.
There are 4x TMR, TIMERS, which is best for PWM?
How I understand it is, there can be up to 10 1-2ms channels within a 20ms cycle.
Why are the CCP PINS used instead of simple timers?
Camerart