it depends more on the amount of ram you have
if you have less than 4 gbs of ram the bfs or the a64 is good
if you have 4 gbs of ram or more the pae or the pae.bfs is the best option for you
the second option handles all the ram you could have in pclinux 32 bit while the first improves on some desktop situations
if you have a older kernel on a old iso, better download pclinux 2011.9 so you have a very recent kernel supporting the possible gpu on the cpu you could be using