The relevant combination is
available on, not
information on, so placing
available closer to
on makes sense. The second of the two is a little awkward because of this.
1. information which is available on ... (as opposed to information which is not available on ...)
2. available information which is on ... (as opposed to unavailable information which is on ...)
Only the emphasis changes in this pair, because the meaning is not significantly different.
CJ