Untethered chargers usually do NOT supply the EVSE->Car cable with them! So that's an extra expense to check up on. That said, I went with untethered, as my Rolec fits inside gge so no issues with appearance/theft, also when I travel away for a few days, I simply unclip the cable & take it with me for the rare times I just might find a multistorey car park with freebie chargers in. Also, my car has old-fashioned type 1 socket, so if my next one's a type-2 socket, or my wife gets a car with type-2 socket, I can swap cables trivially easily.
EO .vs. Rolec - no experience of EO at all. The internal parts in a Rolec can all be changed/repaired by a competent diy-er, parts are off-the-shelf replacements, including the "brains" bit which is about £75 (using a non-Rolec item). No idea what the Eo has inside it. Some chargers have a custom circuit board, so you're tied to that mfr for repairs, = unknown costs once out of warranty. I'm happy knowing I can (and have, as I want to "play" with my software charging strategy) do everything to my Rolec myself. Had my Rolec 2 years now, it's a 32A unit providing max 14A to my car, so had no issues about dodgy RCBOs on the early Rolecs, though I do have a quality replacement waiting to be fitted in an instant if necc.
p.s. it's worth going for a 32A unit, even if your GTe can only charge at a slower rate, like mine does. Not much extra to pay, and v likely to be a better match for next-gen of EVs.
