Price for price, and for equivalent condition, I'd suggest that the Fender would be the better deal. Any signs of repair, on any such guitar, would need to be fully investigated (this goes for most s/h acoustics, of course, but 12-strings have their own foibles...). Check carefully that the sound board (table...) of the guitar is nice and flat; some models have a tendency to have the bridge pull up, forming a 'belly', due to the extra tension of so many strings. To prevent this, it was a 'standard' trick to tune down one tone ('E' becomes 'D' etc...), and use a capo at the second fret to bring it back to regular 'E' tuning. It's always best to have a decent gig bag, at least, or a hard case; be aware that the extra headstock length has to be taken into account when buying a case.
Other than that, it's much like any other s/h guitar. I'd expect to pay about 300€ for those models, in good condition for their age, maybe a bit more for the Fender, but not the double. Good luck with the hunt; report back here when you find what you're after..? Hope this helps.