I need a backup phone for awhile and I've narrowed it down to these two. They're both around the same price on Craigslist and both in great condition. I've previously owned a Nexus One before and know what to expect. My issue here is that if I plan to use it as a backup, do I go with the tried and true Nexus One or the newer and more powerful MT4G? I can't make this choice by myself and need the help of XDA. Thanks.