[{quoted}](name=JJ H0G,realm=NA,application-id=3ErqAdtq,discussion-id=PJ3oFpGx,comment-id=0003,timestamp=2015-01-19T17:25:32.245+0000)
Fighter/Assassin all day. Her E gets a 2.0 scaling off of any on hit effects like BotRK or Devourer, and her Q and E both scale better with her AD than AP.
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As a longtime Eve player I felt the need to log in just so I could reply here. Her E's scaling is the same in both AD and AP: 100% AP and 100% bonus AD, which means it scales much more strongly with AP due to 18 AP being worth approximately 11 AD in gold efficiency. Because of the above gold efficiency, in spite of the AD scaling of her Q being higher than the AP, her AP scaling is actually stronger. The biggest draws to AD for her are her very strong AS boost off her E, the new on-hits, and the strong sustained damage potential from autoattacks. However, you do sacrifice her ult (pretty much entirely) by turning it into a fairly weak shield and slow (until level 16 where it's a decent shield and slow) and as above, the stronger AP scaling.
Frankly, Eve's been pigeonholed so hard into being a hybrid though that neither AD or AP is in any way optimal, nor does she have the tools like Tristana, Kayle, or Akali to run with one side really successfully. She needs changes to her ult to bring it up to par with just about every other ultimate in the game as far as cooldown and damage. She needs to have her damage types looked at because frankly it's impossible for her to build penetration effectively. And she just needs some base stat love because for just about all of season 4 (and now into season 5), Eve has needed to avoid fair fights like the plague unless she's fed (something no other assassin needs to do, excepting those who are agreed upon to be weak).
Going back to the OP's question, Assassin/Mage was her traditional role back in season 1, with a few Assassin/Fighters thrown in. Mage/Assassin started to take that over when she started to run midlane. And more recently she's been forced into the Fighter/Assassin slot. I'd love to see a return to her Assassin/Mage days when her ult actually meant something, she scaled decently into the lategame, and could win a 1v1 against any non-fed ADC without needing to be four kills ahead and with the removal of DFG, that might actually be an option for Riot now.
TL;DR: She needs a lot of flat out buffs and should be pushed more towards the Assassin/Mage idea rather than forcing her to be a fighter. Her ult needs major improvements in particular.