I've tracked responses on this theme and it's pretty split: like colours of the rainbow, you've got your spectrum of preferences. There are those that:
- Love chèvre, will only buy chèvre, and really wish Hermès would discontinue Epsom altogether to save it marring the brand;
- love chèvre for everything else except for SLGs, especially wallets, and prefer Epsom over chèvre because it's thick, stamped, sturdy, and wears like iron;
- love Epsom;
- will take whatever they can get because their not fussed either way and/or their colour/HW/style preferences/availability is much stronger than the leather preference.
So it's really what you're most comfortable with, as it's a big investment!
For me, whilst I love chèvre, I was more than happy with the Epsom Kelly wallet I have. It's over 2 years old and looks brand new and I've used it practically every day. I would not trade it for a chèvre version either knowing now how well the Epsom holds up.
Good luck and please let us know what you decide and get!