I see, I use chessbase 14 to analyze my games... Fritz has always been humorous with its analysis commentary. I honestly can't say I noticed a difference... then again, I wasn't looking. I purchased Fritz 15 for the modifications made to the Friend Mode play against the computer, found under Training. I like friend mode because it automatically adjusts the engine to simulate playing against another human "equal" to yourself. I like playing slow games from time to time and my computer is often the only willing opponent I can find :-) So, I appreciate improvements to this part of the software.
How many games does someone need to play with "friend" mode before it stops being, like, rated 3xxx and comes closer to club players like us?
The difference between 15 and 16 will not be noticeable to anyone other than the top 10 players in the world.
I don't think there is a single top-10 player who is using Fritz.
Regarding ASMFish: I have been using it since some 10 months ago. It hits more kilonodes/sec than Stockfish, stresses the CPU somewhat more, and Elo hike? Maybe there is one, but who cares... Their internal code is almost identical, so their suggestions are the same, most of the time.
Zerbinatti's Sugar is stockfish-devel code with some optimizations. I have used it for a while, and I'm not impressed.