I am developing a wireless solution which will communicate at a lower data rate, 9600 or 19200. I see that Microchip has a nice module, MRF24J40MA with an SDI interface and STMicroelectronics has a module the SP1ML with a UART interface. I know they communicate in different frequency spectrum, but strictly from a programming and efficiency view point, which interface is better the SDI or UART?

I would like to know if anyone has used either of these devices and if so, how well did they work and what was the working range?

For my application, I need 40ft to 100ft and the use will be outside in barns which may have wifi. Yep, the horses get to browse the net instead of just standing there looking out at the greener pastors on the other side of the fence.

Thanks
George