Stand-by time (not talk) because I rarely use the phone actually ;-)
Let's say there are two phones -- Xperia Mini and Wildfire S -- both have very similar battery 1200 mAh and 1230 mAh (respectively), so one could expect similar stand-by times as well.
Yet for Xperia Mini it is "Up to 340 h (2G) / Up to 320 h (3G)" and for Wildfire S "Up to 360 h (2G) / Up to 570 h (3G)".
You can see that for 3G network the difference is huge (almost double). Wildfire S has slower CPU (600 MHz vs. 1 GHz in Xperia) but what kind of computation is done in stand-by mode? Another oddity Xperia is more efficient in 2G, while Wildfire in 3G.
QUESTION: without any head to head tests, what information is more reliable -- capacity or times? I.e. those two phones would stay on one charge for the same amount time or indeed not?
I copied the data from GsmArena pages: Xperia Mini http://www.gsmarena.com/sony_ericsson_xperia_mini-3947.php and Wildfire S http://www.gsmarena.com/htc_wildfire_s-3777.php