what board can i use please?

i am working on a project : wrist wearable device for medical emergencies. where the device will look more of like a wristwatch, sensors such as temperature sensor, pulse sensor, gps and a push button will be attached to it and also an xbee. i initially wanted to use the arduino nano but then i heard of the arduino lilypad. Please help me decide which is the best for this project

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its best that you choose a microcontroller best for it and order a pcb and this would make it compact but

for that i would recommend ATSAMD21G18 Microcontroller for smartwatch with many inbuilt features like

RTC on board USB more flash memory

daehveez:
Please help me decide which is the best for this project

:o This has to be a joke :o