Wow, that is a hard one. I'm going to guess the DAC in the Mac will be a bit warmer... maybe... 2015 design vs a new budget DAC... really hard call.
Don't be too intimidated by your system being in your basement. Positioning and treatments can make a huge improvements. Depending on how many reflective surfaces there are. Try couch cushions, pillows and heavy blankets to experiment with dampening behind the system, sidewall and floor. Great way to experiment, then get "official" treatments later.