Unless you are a carrier loyal sheep and don't want to switch from verizon there is literally no reason to get the S3 over the nexus 4 except for storage (so depending on how much stuff you "can't live without" will decide your decision, although I think it hardly outweighs every other plus). On the downside nexus 4 is sold out everywhere so it's hard to get at least atm
the only problem i see with nexus 4, even with the 16gb storage, is that you can't throw in a flac playlist and call it a day. or a mp3 playlist with a few bits of 720p animes... well lets just say the internal storage won't be enough.
they could've at least added an SD slot though, you could slap in a 64gb SD, bring a spare 64gb SD and call it a day
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i mean, how much cost would've it'd added imho... its a fatal flaw from the eyes of many.
USB OTG - learn it, use it, love it. Also, if you are playing flac files then obviously you are an audiophile, so you must be joking when you are inferring you don't have a cowon player (which have SD slots). Or you could just encode to q5 vorbis (which is completely transparent and even if it wasn't, which it is, you'd have to be carrying around some heavy duty headphones with an amp to tell, which brings me back to why you don't have a cowon device) and store more music than you need on your phone. I can't argue with the anime, but I don't like watching anime in public and especially on a small screen where 480p would look the same.
Also, I'm somewhat annoyed by how fast it sold out. I was spam refreshing (slowly, because sprint is garbage) to try to buy one all morning, went to training at 9:00 (apparently the time they went on sale) and by 9:20 they were sold out. Pre-orders should've been a no brainer.