If you look at the elements that are supposed to make it seem more 'credible' and 'trustworthy', they are:
- Images of the people (along with their name), which traditionally works better than having no images or an anonymous feedback. T
- Having a brand name associated with the feedback (i.e. Twitter) which is probably the more subjective part of the what different people might think about the brand.
- Having an actual way to contact the person, which allows the skeptical people to follow through and verify the testimony. Even though people probably won't go that far and do it, just having the means to do so seems to make it more credible.
I think if you can create those elements in a customized way as well then it probably doesn't matter what option you go with, although you might consider the cost and effort of implementing it.