I think that's because it has the EAF control instead of a throttle.
On the Forte, there's a twistgrip throttle and you can choose to pedal or not pedal. However, it you are too heavy handed on the throttle and don't give cycling help on hills, the battery can experience overload and operate the safety cutout. You can get going again if you help a bit more though.
On the Forza, it's a pedelec, meaning you have to pedal to get power, and the EAF control is a nine level power selector. Therefore you can set it a bit lower to avoid cutout risk if cutout is experienced, and that's easier than trying to hold a twistgrip at an intermediate setting.
Given your low bodyweight, I don't see cutout as being much of a problem if you are not too heavy handed with the twistgrip, but the choice is yours, and depends on your preferences, twistgrip and the option to stop pedalling on the flat, or the EAFs presetting facility but having to pedal all the time like an ordinary bike.
The Forza has derailleur gears instead of hub gears, and you may have a preference there too.
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