Not sure which lossy format to use for Android playback Options

[Cromulent]

My music collection is currently encoded in FLAC format and was ripped using cdparanoia. I want to convert some of my FLAC files to a lossy format for listening on my Android phone at work (Nexus 4 for reference) but am unsure which codec to use. I think the choice is really between AAC and Ogg Vorbis but I'm not really sure. I'm basically looking for the best sound quality with the smallest file size.

Can anyone offer some advice for a newbie in this field (prior to this I've only ever really used lossless formats such as ALAC or FLAC).? Thanks.

[yourlord]

Why deal with streaming it (which can be unreliable) if you have enough local storage to just load it and go? Burning bandwidth caps to listen to music doesn't make sense to me. Plus, where am I going to be and need my music files that my phone won't also be? If I need to dump my files from my phone on a machine a standard microusb cable will do that..

Or, I also run subsonic on my media server at home so if I need better copies of my music somewhere else I can log into that and simply download the FLAC files..