Help to create a new project...

Hello, I would like to set up a new project and I would like to ask you for help.

Right now I have mounted a Raspberry pi 3 + Suptronics X5000.

My idea is to improve what is mounted and I have several doubts:

Raspberry pi o Asus Tinker Board S?

Best hat Dac?

With built-in amplifier type suptronics x5000 or separately?

I would like to be able to control by IR.

Thanks, I hope you can help…