Unless you have a reason to stay in the Apple ecosystem (for example, want to have some specific apps, or want compatibility with Yosemite) iphone 4s is disqualified, definitely. Among other things, camera quality is substantially lower than the Lumia 830.
However, the comparison with the two androids is much more sensible. The screens are the same size and they are good camera phones. However, LG did not, I'll just make comparisons with the S4.
In both cases, the batteries are removable, you can add a micro SD card and the base memory is honest. These are points that will delight all those who battles a day with a full storage memory.
The Lumia is a little bigger and a little heavier to close a few grams. The design is very different, since the lumia is square, with an aluminum contour and a convex screen while the S4 is rounded. Both are enjoyable in their own way. I have
still prefer the design of the Lumia (including touch). For the quality of sensation, materials of lumia clearly give it the benefit (it is an impression, not a crash-test). Shift: however, in use, the screen tends to be scratched. And secondly, at the slightest fall, the battery tends to eject. And because the screen is large, in the back pocket, because of the pressure exerted, it tends to have the battery which disconnects. Thus I turn on my phone of frequently. Since I avoid putting it in my back pocket (that also it avoids making iPhone owners 6, I understand ...).
At the screen, if I did not like the AMOLED far from the S4, the color falsehood has greatly diminished. IPS Lumia screen is good, when to him, but ineptitude on the white when applied automatic brightness programs. Overall, I think the quality of the S4 daffichage screen is superior.
Both phones have a network sensitivity that I would call average (or low). I captured with my best lumia 520, S4 and often loses the network. Difficult to compare (because the two are not on the same network), but it seems to me that the S4 is still a worse degree, from this point of view.
Normal, DAS is low in both cases. That is, it looks good, but I highly doubt: the DAS is a much too simple measure that encourages manufacturers to make phones that capture poorly and suddenly are frequently doing research - which implies maximum transmission power. It is very unfortunate and probably against-productive from the point of view of electromagnetic pollution.
Level camera phone, the Lumia has the advantage. Not necessarily by much. Both are very good. But first, the flash S4 is completely excessive and secondly, image processing applied in too S4 strength contrasts. It drives well, but it is clearly the details and nuances that disappear.
There remains the question of the system: Android (Samsung on mode) vs Windows Phone 8.1. While there, everything is in order. Android is very good for the store, and this is very clearly the weak point on windows. However, some free apps provided by Nokia / Microsoft are quite exceptional: Here I am thinking of which allows for a GPS with downloadable maps for free (no need for 3G abroad so). In large cities, such as London, the bus lines are present and even calculating the route takes well into account.
Another point I find the Samsung version of android (the overlay Touchwiz) fairly "wiz" Android has a native tends to be confusing, but it does nothing to improve things (unlike the HTC Sense layer) . Windows Phone for its part is much clearer, it seems to me-you.
In the end, I think highly of this phone. In this price range, it has excellent competitors Android side. The final choice will be a matter of taste and especially suited to use as you wish. Small point of vigilance, the SIM card must be nano size.
