[over8ed]

I'm currently awaiting the arrival of custom earmolds from Sensaphonics for my Shure SE530s.  In the meantime I learned about the the .flac extention, which has made a world of difference.  While listening to a Vivaldi bassoon concerto I could actually hear the the bassoonist taking deep breaths as well as hear the depressing of the keys. 
 
In order to take things to an even higher level of audio quality I have been researching portable amps.  Based on my research and price range I have narrowed it down to the iBasso D4 Mamba and the Meier Corda 3Move. 
 
Can you make any recommendations between the two?
 
Thanks,
Jeff