I'm not sure what data is collected on stock Android but I'm pretty sure custom ROMs mean nothing is collected.

Pretty much all OS collect your data though so Nokia is no longer safe. WP7 has a habit of collecting data even when you opt out of everything, they were taken to court and denied it for months until Rafael Rivera showed that it was sending location and Wi-Fi data to MS without the users permission. Then further delaying a fix they admitted it was a bug that they would get round to fixing in the next major release. Then another privacy bug was found after the first was fixed ,in the Me hub, which also sends your wi-fi data to MS.

MS argue that they (much like Google and their Streetview cars) "unintentionally" collected this data from you, do you think MS are going to delete the data now that they have it? Fat chance.