This is a tough one, and it really depends on what YOU want.
What exactly did you like/hate about your iphone? That will help people respond to your question.
I'll tell you what I tell everyone looking for a new phone. Go play with them. Honestly, that is the best way to find the phone that you want considering most of the specs are similar unless you are a power user (ie, flashing new roms, rooting etc). Put the phone in your pocket, sit down, walk around with it etc and make sure it fits your daily life. This is specfically true for the Note 2 which is f'in huge. For me, it's size wasn't a huge deal and I returned my s3 for a note 2 last night. The note 2 is f'in awesome, but it may not be useful to you.
In response:
S3: awesome phone, nice features, a few apps you can't delete (I had the AT&T version, YMMV) but overall a very nice feel. I really liked that phone and although it was large (4.7" screen), it was light and easy to use.
Note 2: LARGE. 5.5" screen..which is too big for most people. It also has a stylus (pen) that you can use to write on it and I really like that feature. however, if you have no use for that feature, don't bother.
Nexus 4: I haven't used this yet so I can't say much. what I can say is that it looks pretty bad ass and I'd highly consider it IF it had LTE connectivity.
I live in NYC so LTE is all over the place and the difference between that and 3g is pretty significant. This, however, only matters if you have access to LTE networks.
Overall, I think you can't go wrong with any of the choices you are going to make.
If you live in the states, and you are on contract, the S3 is going on sale at BestBuy for $50 on Black friday (2 yr contract required). If money is an issue, I'd almost think that is a no brainer.
To be short, just go play with the phone and see which one you like best. Everyone has an opinion, everyone has their own interests in mind, so the only way to really make the right decision is to just interact with the phone yourself. You aren't going to pick the wrong phone, all 3 of the phones you are interested in are pretty damn awesome:)
Oh and lastly, Youtube! Go search on youtube for the 3 phones and watch reviews.
I'll tell you what I tell everyone looking for a new phone. Go play with them. Honestly, that is the best way to find the phone that you want considering most of the specs are similar unless you are a power user (ie, flashing new roms, rooting etc). Put the phone in your pocket, sit down, walk around with it etc and make sure it fits your daily life. This is specfically true for the Note 2 which is f'in huge. For me, it's size wasn't a huge deal and I returned my s3 for a note 2 last night. The note 2 is f'in awesome, but it may not be useful to you.
In response: S3: awesome phone, nice features, a few apps you can't delete (I had the AT&T version, YMMV) but overall a very nice feel. I really liked that phone and although it was large (4.7" screen), it was light and easy to use.
Note 2: LARGE. 5.5" screen..which is too big for most people. It also has a stylus (pen) that you can use to write on it and I really like that feature. however, if you have no use for that feature, don't bother.
Nexus 4: I haven't used this yet so I can't say much. what I can say is that it looks pretty bad ass and I'd highly consider it IF it had LTE connectivity. I live in NYC so LTE is all over the place and the difference between that and 3g is pretty significant. This, however, only matters if you have access to LTE networks.
Overall, I think you can't go wrong with any of the choices you are going to make. If you live in the states, and you are on contract, the S3 is going on sale at BestBuy for $50 on Black friday (2 yr contract required). If money is an issue, I'd almost think that is a no brainer.
To be short, just go play with the phone and see which one you like best. Everyone has an opinion, everyone has their own interests in mind, so the only way to really make the right decision is to just interact with the phone yourself. You aren't going to pick the wrong phone, all 3 of the phones you are interested in are pretty damn awesome:)
Oh and lastly, Youtube! Go search on youtube for the 3 phones and watch reviews.