ᐅ Which type of stone would you recommend?

At the moment, I am trying to decide which type of brick to use for the exterior and interior walls. Currently, the options are:

1.) 36.5 cm Poroton bricks (either T7/8 or T9) without insulation
2.) 24.5 cm Poroton bricks plus 12 cm (5 inches) insulation

Which option would you prefer and why?

Thanks in advance!

1, fewer interfaces, fewer potential sources of error.

Option 1
Environmentally friendly, less prone to errors

I also prefer option 1.
We did it the same way :-) (and chose the T8 as the brick, unfilled)