cactus sells for the most money, but you need an effecient and big farm for a constant supply.
melon sells for less than cactus, but is much easier to make at a large scale and more efficient, since each melon block drops 9 melons when broken.
these are the 2 profit shops you’ll see the most, there are other profit shops (like eggs, sugarcane, ect) but they are harder to make / less efficient.
there are also a lot of other factors to take in, like how long you can afk it, if you have enough alts to afk it all, ect.
with all that said, there is no “best” farm, it depends on the situation.
/is warp java is a big melon farm, but it rarely gets afked, making the smaller farms that get afked better.
also shut up scammer imagine irl scamming