I think from a compatibility and clearance perspective the ASRock tends to run into restrictions with a lot of other components due to the almost wrap around cooling towers. It will heavily depend on the cooler you plan on using, but honestly I would say your best bet is to get the Unify as it's probably the best all round Z490 ITX board IMO, there's genuinely no BAD options in the space, they all have big pro's and limited cons, but the VRM, look, layout and features on the Unify make it difficult to contest.Is anyone using or planning to use a z490 chipset mobo? Do we know if these will work well with the T1? I’m wanting to build using MSI MEG Z490i Unify or Asrock Z490 Phantom Gaming-ITX/TB3. (Sorry! I’m still an Intel fanboy! For now).
I guess the question back to you is what do you plan on cooling the CPU with and are you overclocking?