Which stone would you recommend?

Currently, I am struggling with the question of which stone the exterior and interior walls should have. Currently, the following options are available:

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

Which option would you prefer and why?

Thanks in advance!

1, fewer interfaces, fewer sources of error.

Variant 1 Environmentally friendly, less error-prone

I am also in favor of option 1 We have it like that too :-) (And chose the T8 as stone, unfilled)