I'm leaning toward the Cary, since I have always loved the PH 301. Rolled a lot of tubes in and out of that phono pre. The SLP 98L that I found, does not look to have any upgrades but is only 8 years old so not sure how much improved it is over the originals. I believe it sells as a 30 day money back trial. When I spoke to Cary Direct, they spoke of about 3 upgrades that they recommend the most. Seems to me, they should just do it automatically but not how it works.
And be aware, @billpete , that if you order it from Cary Direct and have them do the upgrades before shipping it, I am pretty sure that this voids the audition clause of the contract. Meaning that if they upgrade it before they sell it to you, they are not taking it back if you change your mind.