Depends on your experience with epsom. I had a Prada saffiano wallet (Essentially epsom) that just would not die and looked great for almost too long (I really wanted another wallet, but found it so hard to justify when one was just not needed (unlike bags lol). I’ve had less good luck with Hermes epsom; and I don’t find it as durable (more prone to scratches) and I have no idea why, so if you are considering Hermes, I would pick butler. I have a box kelly longue wallet and I don’t mind scratches, and I have a feeling butler may age similarly. However, the card slots on my box wallet stick (unlike chèvre which stretched) or Prada saffiano (so there is that issue). . .
I love my Epsom wallet and I think it's very durable, probably the best (most practical) leather for frequently used SLGs due to this exact reason. That being said, I'd get a butler piece in a heartbeat because it's so lovely and I'd love to see its patina. However I think it will be very scratch prone (even if they can be buffed), so I think if you prefer your wallet to look pristine / new, then definitely Epsom.
I was shown a very special bag made of this leather, in a tan (like Gold) colour. At first I thought it looked like barenia due to the uneven colourings. But it's way smoother than the velvety feel compared to barenia. Because this is such a new leather, my SA doesn't really know too much as to...
Thread on butler, if you flip to later pages there are some photos of members' bags in this leather that's been used a while. For Epsom I think you can have a pretty good idea just Googling pre-loved Epsom pieces (Butler I think is much rarer to find).
My advice isn't based on practicality but looks...like @880 I had one of the Prada wallets for years and years and it wore brilliantly but I gave it away in the end because I was 'over it'
When it comes to Hermes I personally just dont like the look of Epsom-its a purely personal thing but it looks a bit 'cardboard-ish" to me and because Hermes is known for such exquisite leathers I would rather buy my SLG in something that feels luxurious to the touch and gets a patina-hang the wear and tear!
But thats just me.