From best to worst.
Lumia 920
Lumia 900
iPhone 4S (jailbroken)
Nexus 4 (Don't own it, but played with it for 2 weeks)
Galaxy S2 (rooted)
LG G2X (rooted, Voodoo Sound)
Galaxy S (rooted, Voodoo Sound)
MyTouch 3G Slide
Samsung Behold II (Worst phone ever, Went from Adroid 1.5 to Android 1.6. Didn't even get Android 2.1)
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Before Android, iOS and WP.
HP iPAQ Pocket PC hx4705
HP iPAQ Pocket PC h2215
Nokia 5600 XpressMusic
Motorola Razor V3