I am building an Arduino watch, and will probably design my own PCB. I will be adding a small screen, such as an OLED, and wanted to know the difference between this:
I want to make the watch as thin as possible, and keep the amount of loose cables to the minimum. In my mind, the first one is thicker and will need 4 individual wires to the Arduino, while the second option is thinner and can work if I just design the PCB board so that the 30 pin can be soldered directly to the board. In the second option, would I need to put all the resistors in the first option in my own pcb board?
Also, in the Aliexpress page both of them seem to be able to be used with I2C. Apart from the obvious pin number difference, is there anything else I should take into account.
I guess my question can be summarized as: Is there anything that is added by the board on the first link?