After watching the video (and thank you for posting it!), I have to admit that I prefer the slower rendition. It's more meditative, and there's a quiet stillness behind that notes that seems like a deep well, or pond, into which the notes are dropping. In contrast, the faster version, which it indeed might well have emphasized the chordal aspects of the prelude, seemed not so much joyous as tense. Maybe being a professional, educated, and trained musician causes one to hear things differently, but that's my take.
One of the reasons I sat through the video and watched carefully, was to see the cellist's bowing in order to give myself some idea of which notes/sections are normally played legato by a cellist, and which are played...uh...detached. Sight reading through the prelude as I am, and comparing transcriptions (Lorimer's and Thorlaksson's), I notice that both are pretty much consistent (and sparing) in their use of slurs, confining them to the second pair of sixteenth notes in the first beat of the arpeggiated measures, and using similar restraint in the non-arpeggiated "single-lining"; whereas my ear and my hand want to slur considerably more.
Is this a guitar vs cello thing (I slur because I can) or am I just damned outright wrong and ought to have my fingers amputated?
Needless to say, what I hear in this piece is very different from what is considered orthodox.