I'm hesitant to bump a 30 day old thread, but I also didn't want you to go completely unanswered.
I find no significant fault with either of those center channel designs. For me the most significant factor for that decision would be what you currently have or intend to use in future for your front left and right channels.
Without knowing any of that, if I were just picking my preference between the two you mentioned, my choice would be for the X-CS.
The entry level of components on the X-CS is simply higher performing, for both drivers and crossover components. You will pay a little bit more for the X-CS but I believe it is easily worth that small price difference.
Good luck with the decision and the speaker build.
Elon
Ezeecrossovers@gmail.com