Sorry I donāt have any other opinion other than Iād want the PUA-9 because matching Sony reasons
Problem is, weāre in the realm of taste and preference rather than absolutes. As Bob points out a IV or V could sound better than the 310, but it really depends on your cart and your ears. Iāve had both on different decks and they were a solid choice but ultimately left me a bit cold - to my ears you need a dynamic and colourful cart matched with them to sound any good, but ymmv etc.
No insight on the arm to offer other than Iād be concerned about its state of service and integrity of internal connections given its age.
What I can say for sure is that TT lids make wonderful microphones and youāre better-off removing it when playing music if humanly possible (E&OE re. unruly children and pets rattling about the place).
If the deck and arm are contemporary, it would be odd if they are not fully compatible.
Reviews I read prior to purchase of the Sony and SME agree with you suggesting they can both be a bit matter of fact which is why I went for the Kiseki.
Two cats that are prone to fisticuffs mean that I wonāt be without a lid.