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I don't see any need using one particular person to trade why because price may change, s/he can also change in their character and got you scammed.. see whatever we are doing on p2p exchange we should know that there are scammers who may tends to be a cool guy and whenever their target is reached on specific amount and they got it from you, you would see how fast they could be to report you because they knows you can't trace them.
I think this is why it is necessary that we only trade online with them through the platform and not offline no matter how we trust them and believe that their price is good for us, they cannot be trusted 100% that we won’t have an iota of doubt on their activity since we don’t know them personally. Bybit is the p2p exchange I use now since the unavailability of p2p on other exchanges. I haven’t tried using one person consistently to trade but I usually screen well before placing a trade. This is what I take my time to do because I have only encountered a merchant wanting to scam me by changing the price after clicking on his ads, but I was able to counter it quickly that day. Sometimes is not how good their price looks on the dashboard, but how well they’ve trade with others and good rating they’ve received for their past trades, those should be putting into account before choosing a merchant to trade with on any p2p platform.