Manual cut ALWAYS better for customer, because installer will fit and wrap as a whole in one area then only cut the PPF,, you will never see the PPF plastic at the edge,, they will wrap it to the other / bottom side,, then manually cut.

If machine cut,, edges of PPF is in front / top and will attract dirt,, and if your car is white,, it will look dirty

Machine cut method is usualy used by oldtimer installer for PPF or you can see paint wrap / sticker installer always use the method,, to hide the original color of the car..

Thats why they call PPF a clear bra,, no point to wrap it to the other side because,, its makes no different

For machine cut,, the shop will reduce wastage, a win for them, easier to install even for new worker, the machine will cut ngam ngam using preset measurement, then installer will stick to your car,
but machine cut will have issues for rounded area like your side mirror and etc,, will never hold or sticks properly

G Guard not using XPel anymore, they are using some product from Japan, according to them xpel glue will become stronger overtime and harder to do long term maintenance if you want replace any issues on your PPF,, but i think its all because of cost.