PWM Arduino (H-Bridge) LAP mode or S/M mode?

[corsaveloce]

Good evening friends, I have some doubts on the PWM outputs of Arduino Uno (ATMEGA328P).

I want to use an H-bridge driver for DC motors, but I prefer to create a new bridge with my hands (IBT-2 is not reliable)
So I necessarily need to know the PWM mode of operation.

In the case the attached diagram, Arduino drives two H bridges through the pin and 2-3-9 05/04/10
Ok, and up there no problem ...
But what you need to know I ...

The XPID code (H bridges) is developed for such methods:

LAP mode (anti-phase locked)?

or

S / M (sign / magnitude)?

Thanks