Boils down to personal choice/preference/etc
Boils down to PSI on the piston top
Larger displacement will need *LESS* PSI on a larger dia piston than
a smaller displacement ICE to produce the same power.
Smaller displacement will need *MORE* PSI on a smaller dia piston than
a larger displacement ICE to produce the same power.
Forced fed means forcing in more air and the injectors will squirt more
fuel according to the amount of boost (force)
At full boost, that small displacement will have similar to more
amounts of air as a larger displacement ICE
With more PSI on the smaller displacement...the components must be
designed to last over the warranty period dealing with those higher
PSI's.
Ancillary is heat rejection management. Smaller displacement will
also have both less surface areas (both absorption and rejection) and
thermal pathways to move the heat
On cylinder activation/deactivation...there is a higher level of
complexity. The first gen had them turn off a set cylinder each
time. That lead to engine oil filling those deactivated cylinders.
They now rotate that to all cylinders. So they all get a power stroke
every few cycles
Variable displacement can the also be forced fed...on top of deactivation
Since larger displacement, less stress on the larger dia pistons
Personally prefer variable displacement over small displacement forced fed
