What Class A is better? SUGDEN FPA-4 or PASS LABS XA-25

The question is based on listening!
It is not a project comparison.

designed by James Sugden, for Universities. The A21 was the first amplifier to be put into production

I think you’ll find one that I had was even earlier, the Sugden P51 C51

Cheers George

Sugden P51 C51 pre/power
In case your wondering, 1960's
http://img.canuckaudiomart.com/uploads/large/1792160-sugden-p51-and-c51-combo.jpg

Cheers George

Too many ignoramuses on this thread. If you don't know who Sugden is then why bother commenting? 

I'm using a Sugden A25B on my Altec 620 and it's quite a good little amp. Musical and warm sounding but not the final word in definition and clarity... I didn't listen to the Sugden you mentionned but it's most certainly good... I've heard other Sugden products and they all sounded good... Is it as good as the Pass Lab ? I can't tell since I never had the chance to listen to one... Sugden products are not known in the US but many audiophiles are using it in Canada...