Quick answer cause I’m at work.
I own both. Different between the 2 in many ways. Meze is more balanced with excellent fast/tight/deep bass that’s excellent. Doesn’t bleed into mids or treble.
PH bass even better when modded. Meze faster then the Purplehearts unmodded. Meze is a much warmer sounding and less fatiguing SS as the treble is not as extended at the PH.
Ph very V shaped with extended treble and bass. But again, with driver dampening mod only, Purplehearts are an incredible HP.
The Meze have enough sparkle up top to still be detailed, just not quite like the PH. They are compatible to own both.
Personally, I’d NEVER get rid of either for any reason even even if I had to live out of a shopping cart. Little overboard I know but you catch my drift.
I could write paragraphs on both but back to work.