If release day software updates is the only reason youd consider a Nexus4, then go S3 LTE.
You get 2GB of ram on an S3 LTE, if you like the Pure stock Google look but not keen on flashing custom roms, you can download one of the Launchers.. APEX, Go..
The S3 also has a Wolfson Audio Chip and DAC, so it has incredible audio..
The 8MPx camera is one of the Best 8MPx in any smartphone on the market (Apart from the HTC One X)
You can also Flash stock and custom Roms, kernels and CRCs and Modems on their Release day very easily by using ODIN or CWM (Rooted). There are some excellent guides on XDA which take you step by step. And if you don't like them you can just flash back and forwards, just be careful you know what your doing when going back a revsion.
Its a great device.. I chose my S3 LTE over the rubbish S4.