Not a pro/con for either site, but today i heard from a German buyer who told me that his two 45s he ordered in mid-November 2014 finally arrived shipped from the US. Needless to say, he's "very happy!!"

The thing about Set Sales i used to find on here was that they weren't really worth the time to list here and elsewhere. Even tho they'd be "Termbo appropriate" items, they'd be met w/ indifference due to everyone presumably already having 'em if they were interested and/or just being cheapskates.. i.e. put some LPs on here for $30 for a bit and once the crickets sang for awhile put 'em on eBay to sell overnite for $50 bux or more. That happened more than a couple of times.
The thing about Discogs is that it's sooo super-saturated now w/ stores, etc. desperate to 'move product' that they'll even put New Stock on there shortly after purchase, below the wholesale they paid. A certain crappy shop in BK was doing that, for example, w/ multiple titles of HH's mini-empire (and also other bands/labels that aren't catering to the mainstream) when that was flying highest- things that most here would agree are "good" or at least "interesting to someone else" records. So even tho they might be desirable titles, no one's exactly rushing to buy anything when there are 5, 10, or more of the same title for sale, including some that are pretty darn cheap.. making those titles look or seem less desirable than they actually are in reality. Other clueless shops (newer and even established ones that should've bought a clue by now) see this and not being hip to
anything then act like they wouldn't be able to sell these records thus making it harder to sometimes get good titles that 'we' like into shops. Keep the underground a ghetto and marginalized while hoping that shitty $20+ pressing of 'Rumours' stays in print a bit longer and Jack White makes another
gimmick album soon.
Fuck 'em, ultimately no one really needs to cut those clowns any kind of wholesale deals anymore anyway or cater to any of the old ways. The record industry's been a joke since at least the time of recording black dudes in hotel rooms, never really geared towards helping artists or fans. It's a drag and kind of a Catch-22 but unfortunate for actual fans of the music who think and/or naively expect to find all of the new release they want in their local shop/s.
The thing about eBay, well.. let's just say for now that bacteria/germs are sometimes a necessary evil as well.