SMSL AD18 or Hifiberry Amp4?

I am balancing between 2 installations:

  1. raspberry 4 + smsl AD18 connected with USB (I read this low price amp is great) or
  2. raspberry 4 + Hifiberry Amp4 which already includes a DAC as I understood
    any comment on this 2 options?

I can’t get much reviews on the Amp4, but the SMSL AD18 doesn’t seems that great.