I have the sukhoi with the zdz80 and have 1.5lbs in the nose to get it about 2" behind the wing tube. Servo's are in the tail. It flies great, and I like it as it can do more than I can. I chose the cap for two reasons, I got a great deal on it, and it is something that is different, everyone has a cap and extra, not that there is anything wrong with that.

I have a video of my sukhoi on my prop site below.

IMO you cant go wrong with any of them. Choose the one you like best! The cap is claimed to be the 3d kind though. And your engine will fly them all, but the cap will be the lightest so youll have the best power to weight ratio in your combo.

Good luck!!