Here are the crop profits for each seed, also got this from Diego who is apart of the Trade Corporation gang Raspberry $17, Watermelon $16, Onion $15, Corn $14, Pumpkin $10, Tomato $8, Jalopeno $8, Rice $7, Wheat $5, Strawberry $5, Carrot $4, Blueberry $3. It is recommended to farm bbs (Blueberry seeds) when working because overall it produces the most profit over time and is used in trading. When you are off however, I would advise to use raspberry seeds because it will provide a bigger profit over time than watermelons (although if you go to school, watermelons might be your best choice because it takes about a school day for it to grow, and you might not be able to get on every 3 hrs to harvest the raspberries much more evry 10 minute for blueberries). Hope this helps and wish you the best of luck when it comes to farming.