It really just depends on which modules you want and if you want to be able to add extra sensors. The actual LoRa module is the same on all of them (make sure you order the correct frequency for the location you are in though). The RAK19007 is the baseboard in that picture, the RAK19003 is a smaller board but doesn’t have as much space to add extra sensors etc. If you want a screen then make sure you order one with the OLED display.