"Comparing with my Samsung Anycall, I found iPod is very poor in terms of battery standby time."
或者:
"When comparing iPod with Samsung Anycall, I realized iPod's 5-hour standby time is totally unacceptable."
但是，如果要把一个东西（被比较的东西）作为主语的话，那就该用"compared with"，就比如：
"Compared with my Samsung Anycall, iPod becomes such a poor performer in terms of battery standby time."
