Rakza 7 vs Donic Bluefire M2

Ok, you got the right man here!!! I played both rubbers on backhand, just recently.  

How should I put it...Rakza is much more intelligent and versatile but not as aggressive as M2 (Like Timo Boll Forehand spin vs. Ma Long Forehand Spin))).  You can spin it fast with Rakza but it is never a bullet as with M2. In pure spin perspective on BH Rakza does not lose to M2.

I don't want to dive into into soft/hard discussion but M2 combination (sponge+topsheet) is all together much more bearish/rough comparing to rakza (hope I use the right word and you got my point).

Let's go to your list:
1) Opening BH loop vs heavy chop / push

In this category they are both pretty good. M2 arc will be less versatile but about 10% faster. I would even say, in this category M2 is a winner.

For me in this category Rakza is a big winner, by far. On short flicks it tends to keep the ball longer, even if your wrist was not super fast. I can comfortably control where I land my flick and how I want it (spin or flat, right in the last moment)

If your wrist is fast enough both will do it. 

Rakza will be more sensitive to incoming rotation but control wise it is better. extra mili-second on your racket allows you to send your ball with more precision and with less predictability for your opponent.  So it is a matter of your preference - If you want to be less sensitive to someone's short game M2 rules, if you want to get advantage in your own short game - Rakza

I tend to say Rakza but with new 40+ poly ball I can comfortably block and drive with both. This aspect changed so much with this new ball.

Both will do. I prefer Rakza coz it is a bit more forgiving especially if you are out of position or tend to open your hand  (happens to me sometimes). Speed+spin combination belongs to M2 so if you want to scare your opponent with your crazy A-la Ovcharov counter spin backhand, then M2.

I hope it helps :)

Thx iakovka,

this is exactly the type of info I need - I am glad to say without a doubt I will opt for Rakza here.

I already played with Rakza 7 soft and I know for flicks it is simply outstanding - so much so that any short serve I go with the intention to flick, and then reajust to a push if I am late. 

Rakza I am sure will be similar, and I will like it even more since it is firmer.

I have always liked a rubber which will facilitate, enhance and allow you to do what you want whilst giving you the tools to put extreme spin, and speed (if you hit hard) - I don't generally like rubbers which have extreme properties but force you to play to their strengths... that is why i often shun away from pure looping rubbers despite being a 2 winged looper. I appreciate versatility and variation in game from point to point or set to set... so I am pretty sure Rakza will allow me to play this way better than the M2 now. 

This is also why I chose Adidas P7 as my FH instead of Tenergy 05 FX - the Adidas is more versatile, and allows for a bigger spectrum of options to be played (especially when it comes to drives and smashes for instance)

I assume the comment to the M2 being like a bear meant the Rakza is crisper and sharper feel to it... Where as the M2 is more muted but with more raw power... Again my preference lies with Rakza here, as feeling the ball well is extremely important and it was only this feeling that was lacking with the mushy Rakza 7 soft. 

I actually like my current rubber - the Dawei Super Power XP 2008 - it is the rubber I felt most comfortable ever on my BH... but my coach insists that I need more speed and spin - because at the level I play, active strokes are being used almost all the time, counter-spins or counter-drives as are common as blocks, and I cannot afford to slow down the game each time it gets to my BH.