Recommend a suitable microcontroller

Good day!

I am using the ADXL345 for vibration trending.Accelerometer ADXL345
I am using the Arduino Uno R3 as a microcontroller. Arduino Uno Board R3
Logging and send data via the wifi and sd storage on the Arduino Wifi Shield.

Due to compatibility issue of the Wifi shield with newer libraries. I am forced to either change the Wifi shield or the microcontroller board.

I am currently looking at Arduino Yun as it is has a in built wifi module, it is pretty much the combination of Arduino Uno and the Arduino Wifi shield currently.

Is there any thing that I should take note of ?
And also, i was wondering if the Arduino Yun is capable of taking 3 Accelerometer readings(1axis each) at a frequency of 250 Hz?

Thank you!