I have used both. The Hadou 40+ is tackier than the AK47 series of rubbers and it does grip the ball better IMO.
The AK47 has more bounce and speed. If you have ever used the Stiga Genesis M rubber, the AK47 Yellow is a slightly harder and faster version. Though, the Genesis M has better grip. Actually, the Genesis M feels closer to the AK47 Blue. I often find the AK47 rubbers allow the ball to slip and lose grip (this may be blade dependent). If you need a light rubber to balance out a setup it is worth a try.
The Hadou 40+ is a nice rubber. It is a tacky rubber, but the tackiness is not in the same league as Battle II. The response and feeling is otherwise similar to Battle 2. It is a good middle ground rubber, a do everything rubber. It is not a fast rubber, more of a high control rubber. I found that the Hadou 40+ rubber is a good rubber to put on blades that have too much bounce / catapult for your game.
I found the Hadou 40+ to be one of the best rubbers to put on the Sanwei F3 Pro (innerforce alc version). This was a very bouncy blade for me and the Hadou 40+ tamed it very nicely. The last time I tried that blade I ran Battle 2 on the FH and Hadou 40+ on the BH. My only issue with that setup is there was no feeling at all. Otherwise, it offered good control and was still very fast.
Keep in mind, I am more of a beginner to the game, and I play closer to the table due to limited space in my playing locations.
Hope this helps...