This was tested by Rafael:
Heres a link to the photo:
https://www.facebook.com/photo.php?fbid=402737903072678&set=o.310834602309612&type=1&theater
Basically this is what the photo shows:
With Rafael's attack and with both the Lightening spike (base dmg 9, enchant level 6) and the Dark Crimson Blade (base dmg 8, enchant level 7) maxed out at top enchant level the Lightening spike gives him a total battle power of 2250, while the Dark Crimson Blade gives him a total battle power of 2348.
So basically Enchant level is more important than base damage. And base dmg 8 enchant level 7 weapons are still the best in the game.
Hope this clears it all up for you
biggrin