These two mice are on first sight quite well equipped. I had the impression of a good quality, though not very good product for both models. Unfortunately, both models are only suitable for people with large hands. Even with my medium sized hands they are uncomfortable with prolonged use and not really designed ergonomically.
Last but not least, I then looked at the Logitech G402 Hyperion Fury mouse must say: Unlike the two other Logitech mice are significantly worse. The build quality is significantly better in the G402. She is medium sized hands comfortably in your hand. In particular, but the programming shows how useful and simply ingenious you can now make an individual adjustment to any number of programs. My Logitech has in many of my programs (not only in the games) targeted allocation of the keys. These are really very easy to program. The best, however, is that the profiles are changed automatically when you start the respective programs. Since neither the Drakonia nor Decus Core can keep up! What I have in Drakonia of 5 profiles that I always have to switch over manually from? Complicated as it gets. The Makroprogammierung is not satisfactorily resolved. The Speedlink Decus can indeed automatically the few profiles it offers, go, but even here, weaknesses reveal. Why it is not easily possible, the Explorer assign a profile.
Even the shooter is aiming at in the much more direct and precise will Logitech!
So if you can invest a few more euros, you should rather equal access to Logitech. It's worth it, the more benefit is significantly higher than the difference in price suggests!