I too have a passion for the ry's, but have only tried the dekang ry2 and ry3, and some prefilled ry4 carto's kanger, but i am not sure, they came in a black box with the word accessory in white, with the flavor and nic level in black lettering on clear stickers. I found the ry4 cartos to be far to sweet. I first tried the ry2 about a month into vaping and loved it far better than the camel and turkish dekang flavors i started with, being a camel smoker. I now find the ry2 to have too much of a smokey flavor, almonst tasting like a hickory smoke flavor. The ry4 had almost none of this smokey flavor at all. I find the ry3 to be almost like what i remember a brand of smokes that is long since discontinued called 'honey toasted tobacco.'
RY juices are like goldie locks. one will be too sweet, one will not be sweet enough, and one will be just right.