Well since you didn't give anything discriptive I'll just tell you what I know.
The Chronos as it is called, is a powerful time warping machine whose domain lays with whomever controls it. It is not large and can be worn as a watch or necklace. I caution the user on time manipulation though, as the effects can be catastrophic.
The Excalibur on the other hand is a famed mythical and magical sword possessed by King Arthur. Legends tell of it's mysterious power and unbreakable might. Those who wield it are said to have the power of man and the ability to bring others unto them.
I dunno...I kinda like swords so I'd stick with Excalibur :D
Hi. I've had the Excalibur clock for a year and It has been working well but I was thinking about getting the Chronos. Are there any major advantages about the chronos cause if there isn't i think I'll just stick with the excalibur.