If you do gaming, both are OK; I personally would go for the Logitechs, as it has Dolby 7.1 and it can rotate the cups. Siberias on the other hand looks more high-end and sports leather on the earcups.
If you mainly do music, you must go find a showroom and test both of them, as specifications means little for the one's personal preferences.
I do indeed do gaming. Thank you for your input on the subject, for that, I'll give you the Best Solution.