I guess you were lucky to receive a good pair of modules.
I would get the Transcend but I am in Canada and my laptop is with a friend in the US who'll bring it up here in a month. So I don't think I would be able to do any exchanges from up here if I do find the Transcend modules giving me errors, considering quite a few bunch of people here are receiving faulty modules.
Now, if these Samsung modules have lower failure rates than Transcend, I don't mind paying the extra $20US to get them. And btw, I know a lotta the other module makers like ocz, corsair use Samsung chips in their products, so I figure if Samsung is selling their own modules with their chips, might as well get those and know that they have Samsung chips.