Which latest iphone is batter?

I want to buy a latest iphone with advanced technologies, there are so many iphones in the market so i'm very confused that which one is better for me. I want to invest near about $500. Please suggest me.

Leave iphone and go for upcoming galaxy s5

The latest iPhone would be 5s. However considering your budget a 5c would be as close to what you can get with the latest technology. What's best for you is for you to go to the store and try them out yourself and decide what works for you. All the latest phones from Apple, Samsung, HTC, etc would cover mainly everything that you need a smartphone to do.

Obvious 5S is best.

All the best of the iPhone 5 - Despite its looks on the outside, the iPhone 5C is essentially an iPhone 5 with a new design. This means that all of the strengths of last year's iPhone 5 are present in the 5C, including the 4-inch Retina Display screen, improved camera, 4G LTE networking, slim design, and more. The iPhone 5S costs as little as $199, but that requires a two-year phone contract, which can cost nearly $2, 000 depending on your options.

As you asked about the iphone i will say all are of best advanced technology implemented which we can't get of that quality and trust worthy in any other brands of cellphone.

But among the iphones i will advice you to have the iphone 5s its of high quality with advanced features incorporated in it and with best way to help out the person having it or thinking of buying it. They made the phone user friendly with all tasks to be solved out with the help of it while roaming anywhere. It supports all types of doc file, music files and so on.

Now i will say that you have to invest large amount of money in getting a iphone so compare all others too before buying anyone because once you get it no chance of changing will be there.
So here are some features to help you out with qualitative buying of iphone 5s:
General
2G Network GSM 850 / 900 / 1800 / 1900 - all models
CDMA 800 / 1700 / 1900 / 2100 - A1533 (CDMA), A1453
3G Network HSDPA 850 / 900 / 1700 / 1900 / 2100 - A1533 (GSM), A1453
CDMA2000 1xEV-DO - A1533 (CDMA), A1453
HSDPA 850 / 900 / 1900 / 2100 - A1457, A1530
4G Network LTE- all models
Body
Dimensions 123.8 x 58.6 x 7.6 mm (4.87 x 2.31 x 0.30 in)
Weight 112 g (3.95 oz)
Fingerprint sensor (Touch ID)
Display
Type LED-backlit IPS LCD, capacitive touchscreen, 16M colors
Size 640 x 1136 pixels, 4.0 inches (~326 ppi pixel density)
Multitouch Yes
Protection Corning Gorilla Glass, oleophobic coating
Memory
Card slot No
Internal 16/32/64 GB storage, 1 GB RAM DDR3
Data
GPRS Yes
EDGE Yes
Speed DC-HSDPA, 42 Mbps; HSDPA, 21 Mbps; HSUPA, 5.76 Mbps,
LTE, 100 Mbps; EV-DO Rev. A, up to 3.1 Mbps
WLAN Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi hotspot
Bluetooth Yes, v4.0 with A2DP
USB Yes, v2.0
Camera
Primary 8 MP, 3264x2448 pixels, autofocus, dual-LED (True Tone) flash, check quality
Features 1/3'' sensor size, 1.5 µm pixel size, simultaneous HD video and image recording
Secondary Yes, 1.2 MP, 720p@30fps, face detection, FaceTime over Wi-Fi or Cellular

5s.

Simple answer.