Okay I decided to do a comparison of the two engines and in regards to how they are setup they are almost identical in regards to materials and and lighting.
Update: Okay heres the raw images side by side both rendered for 15 hours MW- reached SL 19.58 Fry - reached 343.00 passes. Both have Glare applied to them. Some things to notice, the MW cam is a little out of focus really hate how their camera works its always difficult for me to get a crisp render. The Fry black surfaces are not a rough as the MW ones so it will look a little diffferent there as well. Also I over did the floor bump in the Fry version. And on the MW one I didnt texture some of the plant lol.
Heres the stats from each renderer:
Now we have the two images side by side again with same neat image preset used on both the fry noise reduction is a little stronger then what I used on the maxwell version. Then they where both taken into PS and had the same sharpen settings applied and were both downsized to the same size.
Summary in this COMPARISON (thats all it is not defintive im no expert in Fry) first things I see about Fry is sample quality lots of stand out noise after long rendering periods Maxwell tends to dull out the noise it looks like making it less noticable while Fry noise remains strong and rather pronounced. Theres often white specs everywhere especaily regarding blurred reflections ND for the floor is 20 and the metals are 40 so very high ND values since they are in nature very reflective.
Glare yikes Fry is a pain to work with glare I HATE IT and the first reason is its slow very slow making new settings is easy enough even though I have no clue what those sliders do lol you hit the check box and see two sliders side by side they need to be labeled I think as it stands Fry is to slow to trial and error with Glare over 2 minutes per sync when adjusting setting MW does it in a matter of seconds. Secondly diffraction again you see to number areas but dont know what they do and what are those image slots? Are they for an obstacle map and apeture map? Who knows their not labeled so I didnt bother with them. Next thing I noticed about it notice how the glare is really only visible on 3 lights? and nothing else.
Control..... Fry wins in this area hands down. Lighting control and layer blending cant be matched by MW adjusting temps, RGB values and strengths all on the fly is very very cool and we cant forget seperate sunlight control which makes Fry all that more desirable. So both have their strong and weak points. Maxwell quality and speed since 1.5 is alot better then Fry, Fry has much more control over everything and produces sharper images but at the cost of slow clearing noise and speckaled images at times.
Theres more I could cover like displacement and all that but we already know all that.