Fritz has value only within the Chessbase ecosystem. If you just want an engine it's an incredibly bad deal as Stockfish is at least 200 ELO stronger and free software (as in freedom AND beer).
Also, if you have a multi-core system (and if you don't, you really need to buy a new computer) you should get the "deep" version of a given engine to allow analysis parallelization.
So, I just bought Fritz 13 for $14 on Amazon. I owned Fritz 12 before that. I know that Fritz 14 was released, but it's around $90, which is quite a bit of money in my opinion for a chess software. Was my Fritz 13 purchase worth it in your opinion, or do you think I should stayed with Fritz 12?