Would you go for phone and pa?(E12) or go for dedicated mp3 e.g ColorFly C3?
Answers on a postcard please
I have a Fiio X3 and Sony F805 for on-the-go.
Since I care about replaygain and Fiio X3 doesn't have this feature (yet) I need to amplify my entire library with audacity so I am doing this day by day, cd by cd. Now the F805 is my main on-the-go player, it has other features too but it pairs extremely well with RE0 and quite well with SM3, but I keep my SM3 for ultra-portable use with my Sansa Clip+.
With the iBasso T5 amp, Fiio X3 is superb and reaches the level of my iBasso D4 USB DAC+AMP with OPA1612.
I don't use an amp with my F805 and find not all IEMs pair really well. MEE A161p don't match to my ears.