First Sound Presence mk11 vs Audio Research L.S.25

I am in the process of changing pre-amps, from a Audio Research L.S.25 MK1 to a First Sound Presence Deluxe MK11.
I have not had the chance to demo a First Sound pre yet.
(I HAVE BASED MY DECISION ON DEALER ADVICE, PLUS REVIEWS)
How would you compare the two? Sound quality, noise etc.
My power amp is a Bryston 4BST, VPI SCOUT with Dynovector dv20xh mc cartridge, Audio Research phono pre PH5, Ohm 300 MK11 speakers
Thanks for the advice.