I decided to run a test in three varying areas of my game to get a feel for how it handles. So for three sections of Courier:
Overworld section:
Back to Front:
~11,890 Objects, 60FPS, 70-85% CPU load depending on what I'm doing
Front to Back:
~11,800 Objects, 45-55FPS, 90-96% CPU load depending on what I'm doing
Effects range from low to medium-high depending on location, many objects but not always a lot moving, medium characters in one area.
Small Town Section:
Back to Front:
~1,335 Objects, 60FPS, 25-27% CPU load
Front to Back:
~1,335 Objects: 60 FPS, 30% CPU load
Effects-light, little movement, medium amount of characters
Dungeon with a lot of water and effects:
Back to Front:
~1850 Objects, 60 FPS, 68-75% CPU load
Front to Back:
~1850 Objects, 60 FPS, 70-80% CPU load
Effects-heavy, lots of moving objects, low amount of characters
Core i7 4770 3.4 GHz, 16 GB ram, GeForce GT 640 4GB
My game is typically composed of a lot of overlapping objects, so I would think it would be good candidate for Front to Back. I do have effects in some locations which may be negating gains. I also have layout-wide HSL and Exposure shaders for color correction, so that may be a problem with it too. I do get some rendering differences between them, but that's beyond the scope of this post.