Zelle and Venmo may be best for the seller, but as a buyer, I would want the protection provided by PayPal. Through the years, I’ve bought used gear that for the most part has been fine. But one integrated amplifier had a defect the seller refused to acknowledge, and PayPal saved me from a terrible transaction.
I might consider methods with no recourse if buying from an established dealer that I’ve done business with before. Might.