Quick question. AT&T Nexus 6 topic

So I have been a die hard Samsung guy since the beginning of Galaxy s. Today I decided to go with a nexus6 from at&t. I know zero about the phone and the Motorola **** tied to it. I am very familiar with odion and and using custom Roms and recoveries with my note phones. My general question is, will any ROM work on any nexus 6 or is it service provider depending...? Also if anyone could post a link to the best root method for the AT&T Nexus 6 I'd greatly appreciate it!

Sent from my Nexus 6 using XDA Free mobile app

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