I raised this point yesterday, and saw it was questioned again in #255. Its a SLF view on things and I think the answer is the one I have always believed in: there are no "best" seats in the case of crashes. Its all about luck (none in this crash), and if lucky then its about following proper evacuation protocols (e.g. BA38).
The facts emerging are that the survivors (who mostly seem to be in desperate conditions) were seated in rows 14-17 - as per El Mundo who have no doubt checked this against the manifest.
Info on the graphic sequence here:
Gráficos | elmundo.es
(click "comenzar", ignore graphics themselves which are clearly suppositions, the one with the survivor seats is at the end)