Devore O/96 vs Volti Rivals

Those speakers sound very different.  You need to hear them for yourself and draw your own conclusions.

What are some of the reasons why you are considering these two speakers (other than being listed on Stereophile)?

I demo'd the O/96s(with Line Magnetic components) and had the Volti Audio Rivals in my own system for a proper evaluation. Both are very good and enjoyable speakers...I can't see you going wrong with either, unless you have some very specific needs / preferences, which is the reason for the question above.

The O/96s are significantly higher than the Volti Rivals (list prices for each), unless you are going with a very custom finish for the Rivals.

Dig high eff? Ever heard Sonist Concerto 4 ? 

The Volti's are horns and O/96's are conventional box speakers as said above it's apples and oranges. Personally I've fallen pretty hard for horns but as with all things YMMV.