@jamieskella I'm guessing by your signature you went with the Ananda..How are they?
I'll answer by saying that after a few hours of use, the following idea has crossed my mind: I might sell my HD800S and TH900... or maybe not.
The attack and decay of planars put a massive, massive smile on my face. I'd say these things are EDM beasts, if you value accuracy over quantity. For me, I think there's still enough quantity. For rock and metal I'd love to see an extra ~2 dB boost in the 50-150Hz (or thereabouts) range to thicken up what I'm hearing. There are characteristics of these cans that remind me of the HD800S, but I'm enjoying these more - there's more life to them, despite remaining relatively neutral, without feeling like I'm missing out on detail. There's a bass quantity which the HD800S can't match without EQing it. As for the TH900, if want TH900 bass, I can kind-of get there via EQ if I'm in the mood for some bass-canon listening. Additionally, while these are quite bright and there's a lot of forward detail, to my ear there's no harsh treble peaks like what is present in the HD800S and TH900 (the TH900 especially).
The size of the driver also does something remarkable for music and gaming - it's quite an experience. I'm thoroughly enjoying these in Apex Legends right now, with no apparent positional audio compromises yet. More gaming time is needed, across more games including R6S where positional audio is so critical, but my initial impression is that I'm doing a better job of understanding player locations with these than my HD800S.
I'll let you know if I still hold these opinions after a few more days of use.
As for why I opted for Ananda over the Arya... in the store it sounded almost as if I were wearing the same headphone. I know 30 minutes in store isn't a good judge of nuance between such similar cans, nor trying to pick technical superiority between them, but I wasn't willing to spend an extra AU$1200 for something that might only
look much better. That said, I'm tempted to buy the Arya as well, returning the ones I like less, so I can give myself the time to see what differences I might discover with a few days of critical listening on both of them...
(For those with bad vision: Purple is Ananda, green is Arya. Source:
https://www.headphones.com/blogs/news/hifiman-ananda-vs-arya-planar-headphone-review-comparison).