XLR or RCA for my new DAC

I use XLR with my Schiit Freya Plus preamp (DAC --> Schiit via XLR).  I tried RCA but XLR yields a higher gain and that was the deciding factor for me.   

XLR!!

I use XLR as my preamp is balanced and I get more gain. If single ended, I would use RCA.

It only matters if the Xlr are truly balanced from input to output 
on the dac as well as the preamp , I have been  involved with audio over 40 years ,on most ,if you pop the cover the rca, and xlr are connected together before the output  in the chain on over 90% of all units out there , it’s a nice selling point showing both rca,and xlr.
for if it’s not true balanced that extra ground on the xlr just connects  into the 2 wire outputs ,True Balanced will have transformers for inputs and outputs which is very rare .I have had balanced  cables and the rca same brand had better imaging, the xlr had a bit bigger soundstage a hair quieter depending on the design. It’s not a straight forward conclusion.

OP, happy for you to have found the magic a good DAC can bring. I love it when people really get a noticable improvement on a piece of gear. That bifrost has multiple inputs I believe. Could be a good opportunity to explore the world of streaming. Happy listening and keep posting your impressions with the DAC, they are fun to read. 

Kyle