DAP and DAC Advice: K13 R2R vs M21

I currently use an iBasso DC07 Pro with my IEMs (mainly Simgot EW300 and Juzear Defiant for gaming; FatFreq Deuce, Punch Audio Martilo for music) on my PC and planning to get headphones later (maybe planars).

I had basically finalized getting the Fiio M21 as an all-in-one DAP and DAC solution, but found out about the K13 R2R recently, which is the same price where I live. Since I mostly listen at my desk, would the K13 be the better pick for desktop use? I could then get a cheaper DAP just for portable FLAC playback and maybe run it through the K13 when I listen at the desk.

Would the K13 R2R be a better option for desktop use; I am so a bit confused what I should do. I could get a cheaper DAP just to store FLAC files in once place.

I tend to prefer warm/bassy sound, sensitive to sharp treble and sibilance.