For starters, "superior" doesn't mean anything in absolute terms... superior in what way?
When reviewing you have to consider both performance (pure objective technical abilities like detail retrieval, speed, soundstage...) and tuning where coherence is key as well as how you describe what can help people know if it matches their personal preferences (yes, those are key even if you're aware of your own preferences as a reviewer which you must if you want to make sure you're not too biased).
The EM10 is not as known as many of its competitors because the brand is targeting professionnals mainly (around 3/4th of their sales) and then audiophiles so they don't market their IEMs as well as many competitors. All the same, the EM10 is a top contender even with current flagships. Earsonics has top notch craft and tuning knowledge. Technically it competes with the best, but the signature might not be for everyone, especially the very coveted asian market in the flagship segment where competitors that do aim for that market put a focus on resolution and treble extension as well as exclusive materials for the shells and incredibly luxurious packaging (think Vision Ears Erlkönig for example). Granted, the EM10 is a custom only model so this means compared to most customs you can't customize it with personalized shell, Earsonics is a bit like Ford T you can get it as long as it comes in black
You can see how the main pro target of Earsonics has its own shortcomings... This is one fo the reasons it didn't take off in most markets.
The EM10 is probably one of the most undervalued custom flagship and it's sad because along with strong technical foundations it has a distinctive tuning and I rate this quite highly these days where "more of the same" is common.
Purple is more akin to the EM64 than the EM10 by the way, and saying it's superior makes no sense as Purple as a switch system and a more forward signature than the EM10 so not the same tuning...