It depends a lot on what tonality you prefer. According to FiiO FH7 or Shuoer EJ07 . They have dynamics, but they also have an open presentation and a very good soundstage , excellent resolution i very good mids. I have FiiO FH7, but I’ve read a lot of reviews about Shuoer EJ07(original). Zen are for brutal prog metal. With Zen you will not experience pleasure from the stage, only dynamics! But here some people only recommend Zen for prog metal, which is a pity !! Good luck…
I’ll take a look EJ07 and EJ07M 
But FH7, i had a good listen with these about 2 years ago and i found them nothing except plasticky. They have so much BA timbre with me, that’s worse than my SA6. So, i skipped them. I find FH3 even more exciting and more organic than FH7.
Thank you for EJ07 suggest!!
2 Likes