[Users] Why would one prefer Sylpheed over Claws Mail ??

[anton92 at gmx.ru]

I apologize for sending the previous email in the HTML format. I did not even realize it.
Anyway, here below is the original text which got scrubbed by the bot. Thanks to those who have already answered.

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I was very surprised to discover that Sylpheed (instead of CM) was chosen by the Fedora distro.

>From what I understand CM is much better than Sylpheed, because it has many plugins and a more vibrant community, so I really don't see why Sylpheed could be preferred over CM.
I was not able to find much info on the internet about the difference between the two programs. All one finds is that CM was forked from Sylpheed and is now managed by a community.

Could you please provide some info about the differences?

Above all, is there some area where Sylpheed is actually better than CM? Any particularly feature? 
Is Sylpheed also mono-threaded like CM?

Cheers

Anton