Tips and guidance for Arduino Yun + Sound Detector

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hi, have small project not sure parts go for...(i new making hardware...learning)

requirements:
a. make post or requests webserver
b. detect sound


part a:
i have been reading arduino yun , seems can use make http requests or post webserver.
how different compared using arduino wifi shield?
and today..i found this...
http://www.arduino.org/products/boards/arduino-uno-wifi
i'm confused 1 should going for?

part b:
i need detect loud sounds..then send request using above. can use sound detector this? examples i've seen detects soft knock or clap sounds, need detect loud sounds only. potentially repeating 10 seconds. possible using:
https://www.sparkfun.com/products/12642

or have use else measure frequency repeating?
https://www.sparkfun.com/products/12758

appreciate guidance!









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