We've put together a list of the main differences between them, so you can decide which to make room for in your pocket.
Price
The 5c was rumoured to be a budget iPhone, but that turned out to be off the mark.
It'll set you back £469 SIM-free, or starting at £30 on contract (though you'll have to shell out £32 a month for two years). And that's the more affordable of the two new additions to the iPhone range.
The 5s costs from £549, though it'll be much cheaper on a contract.
Exactly how much cheaper we don't know yet, as you can't pre-order the 5s. But either way, these are the most expensive iPhones ever.
One of the major differences between the two is the fact that the 5s has a fingerprint scanner built into the home button.
Not only does this make the device more secure, as you're not using a PIN code, it also makes it much easier to buy things from iTunes.
Fed up of entering your Apple ID every time you download a song? You won't have to with this, just touch your finger and you're done.
The 5c features nothing of the sort, as it's basically a restyled iPhone 5. Which brings us onto…
The 5c is the brightest iPhone ever, coming in a selection of five colours: green, blue, yellow, pink and white. There are optional cases available in those same hues, giving you dozens of potential colour combinations.
The iPhone 5s is a lot more sober, but still comes in more colours than its predecessor. You'll be able to get the 5s in champagne gold, silver, and space grey.
It too has a selection of official cases, but these ones are leather, compared to the 5c's silicone ones. The 5s's case comes in brown, beige, black, yellow, blue, or red.
The iPhone 5c has the same camera as the iPhone 5, but the 5s has tons of new imaging skills. The sensor is 15 per cent larger, which should improve picture quality.
There's a wider f/2.2 aperture, letting in more light, which should improve the quality of your low-light shots.
Burst mode takes lots of snaps at once and automatically picks the best, or you can browse them and choose another.
You can now shoot video in slow motion, too.
Nokia has so far ruled the roost when it comes to imaging on a smartphone, but the 5s could well unseat it.
he iPhone 5s features a whole new chipset. The A7 processor replaces the iPhone 5's A6, and should run twice as fast. (The 5c is still stuck with the A6, so may seem a bit sluggish in comparison.)
The A7 should also mean much better graphics in games. But not only that, the 5s also features a new M7 motion coprocessor.
This brings together all the data from the 5s's compass, accelerometer, and gyro motion sensors so it knows exactly how you're moving.
That could pave the way for a whole new generation of fitness tracker apps, which the 5c will miss out on.
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