Energy Efficiency or Cost of Equipment don't matter, for no proof of work based crypto currency.
As long as it is cheaper to mine a coin than to buy it, or as long as you can sell it for more than it costs you mining it, new miners will get in until it reaches a balance and the energy consumption = worth of new created coins + tx fees.
This is just how a marked with no / very low entry barriers works.
The point remains, that with ASIC you need special equipment to attack a chain, while with GPU / CPU you can do it with regular equipment.
So I would consider "ASIC-Proof" a (very small) disadvantage.
Other than that, in matters of security and energy efficiency, there are no differences to speak of.
Edit: Wow, I think this was my first post on the Alt-Subforum