I use FZD ALC and I like it a lot. Recently, I purchased Ovt Innerforce ALC just because I like Dima.
I know that Ovt ALC has almost the same reaction rating, 11.7 vs 11.8, in comparison with FZD. So I thought it would retain the same speed and add more control.
But trust me, I was wrong for a big time. Ovt ALC is stiffer, and I prefer stiffer blades, but the feel between the two is completely different. I use D09c on both blades.
Ovt ALC is stiffer, almost has the same speed, low arc, but a weird feeling that it holds the ball longer than my liking. The shot I use in FZD goes out when I use it with Ovt ALC, and shots with less effort in pushing go to the net. I like serving with Ovt ALC and backhand flicks as it was effortless, but the feeling between both of them is completely different. I've used Innercarbon limba blades before, and the feeling was not that much different. But Ovt is something unique; it is fast but holds the ball much longer before releasing it.
I still couldn't adapt to it, and I don't think I will. I will stick with FZD alc coz I got used to the feeling.
Other than that, yes, Ovt ALC is head-heavy, but you'll get used to it eventually.
So it ends up based on your preference, but both have drastically different feelings.