What's Your Advice, Used Audio Research LS15, Or Freya+?

the op has really no way to know but to get both and try in his own system

short of that, he is asking for input

i have not heard a freya in my own system, but i have in others... but of course, not A/Bed against an sp15

i would say that so long as the unit is in good shape and checked out, no caps or tubes failing etc etc, the sp15 is one of the units that audio research built its name and reputation on in the 90’s, designed and built to take on all comers ... at the time it was its main linestage under the megabuck reference one ...

you can bet this preamp, while no doubt having its sound signature, makes absolutely no apologies to the linestages on the market today in the 2 grand price range

Thanks to all for their thoughts. One more question. I am looking at two very nice LS15's. The first is an older model with the attached power cord. The second one is a very late model with the detachable power cord and various ARC improvements. The price difference is $600. Is there $600 dollars worth of performance difference between the two? 

@zerobias the new modal with detachable cord has Infini Caps which where a upgrade to the REL cap in the older modal. If yo sent the older modal out to ARC for a cap upgrade it would cost about $600. I have had my LS15 for 16 years and am the second owner with no problems at all, works perfect and sound great.

I actually just returned my Freya Plus and Loki after comparing it to this. 
https://www.youtube.com/watch?v=fS4LwM7omSE

Just want to thank all who responded, here and by PM. The input is greatly appreciated. I found and purchased a very late model LS15 with all of the upgraded caps, the power supply, and the detachable power cord. Looks very nice from the pictures. I hope to have it Friday. Now for a headphone amp, it does not have a headphone jack. Thanks again, and happy listening.