Stonehenge Etrigan or Darkseid. Its been a while since I read the issue where Etrigan fought the Sentinels. Was he actually giving out better than he got or was he merely holding his own? Both would be impressive considering the power at the disposal of the Sentinels but if its only the latter then Darkseid can still beat him.
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“Where the longleaf pines are whispering
to him who loved them so.
Where the faint murmurs now dwindling
echo o’er tide and shore."
-A Grave Epitaph in Santa Rosa County, Florida; I wish I could remember the man's name.