That is a tough tough call.
I’ve said in the past that i think the rme adi-2 dac is the absolute best value per msrp dollar piece of audio gear i’ve ever owned, performing far far above its price point.
While not as fast as the h2, it is definitely “good enough” to make the utopias highly satisfying to me. I have other dacs but the h2 and adi-2 are the only two that i use the utopias with. Everything else i own just makes the utopias feel...well...”less”.
The h2 utopia combo can be a tad bright on a good number of songs, though an eq feature on a dap helps a ton wothout removing detail.
Either way is a great choice.
Heck, the adi-2 and h2 are two pieces of gear i will never sell. They’re both just that good.
I’m still leaning towards the ADI-2 due to cost and from what I understand the USB implementation is good (H2 sounded much better via Schiit Eitr). Makes the H2 more expensive as I’d have to buy that to. Makes the whole package less transportable once again.
Also, having used the Liquid Platinum for a few days I’m in love with that. Wallet suggests that I should err on the cheaper side when it comes to the DAC for now.
Means I can evaluate all my headphones (including IEM) direct from the RME and then through the LP too. (Not that I couldn’t also do that with H2 of course).