While I'm not sure what exactly Fritz 15 will offer (because it hasn't been released), but it's almost certain that there will be a "deep" version. Look at this ChessBase online search, so it's pretty safe to assume there will be Deep Fritz 15. My suggestion: wait for the upcoming version.
I tested both of them and they are almost the same and Identical in engine tests. just less than 10 percent difference in game win rate. I also tested many other engines against fritz which most of the time they win it easily. (engines like: Sugar , Houdini 6, Komodo 11, Stockfish 8, adnsacs). I added the bullet games table here. Anyway even with longer time controls fritz loses.
This video course includes GM Anish Giri's deep insights and IM Sagar Shah's pertinent questions to the super GM. While Vol.1 dealt with 1.e4, Vol.2 has all the openings after 1.d4 as well as 1.c4 and sidelines are covered.
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