ITX BUILD CPU

Hi, I am doing an ITX build and have narrowed my MOBO down to two.
Asrok z270 Gamin itx/ac or Asrock z370 gaming itx/ac

I am only using this computer for music production (both midi and audio) I will be using a lot of VSt instruments and effects as well.

I am debating on which mobo to go for and which CPU I know I am limited to 1151 however this is the only ITX MOBO that has thunderbolt already included in it.

Keep in mind I am not gaming, only making music and checking emails and whatnot.
z270 is 6th and 7th gen and z370 is 8th gen