Features Key features of the Xperia M  vs Ericsson Xperia arc S 

screen size

Everyone we showed the handset to loved how slick it is, and even we seasoned veterans couldn't help but agree that tall, thin and narrow seems to be a good solution for big screen handsets.
Xperia arc S | by PhoneArena (Oct, 2011)

screen resolution

Xperia M
854 x 480
Xperia arc S
854 x 480
The photos came out sharp enough, color representation is accurate, detail is plenty in daylight, but there is overzealous noise suppression, which smears the details when light is scarce.
Xperia arc S | by PhoneArena (Oct, 2011)

memory

Xperia M
1 GB
Xperia arc S
0.5 GB

processor

Xperia M
Dual core
Xperia arc S
Single core
We say stopgap, since the Sony Ericsson Xperia arc S keeps the breathtaking design of its predecessor, but ups the ante with a still-single core 1.4GHz processor, 14.4Mbps instead of 7.2Mbps radio, and teaches the 8MP Exmor R camera some new tricks.
Xperia arc S | by PhoneArena (Oct, 2011)

camera resolution

Xperia M
5 MP
Xperia arc S
8.1 MP
The 8.1MP setting is only available if you select 4:3 aspect ratio shots, with the camera dropping the megapixel count to 6MP if you'd rather capture images in 16:9 format.
Xperia arc S | by TechRadar (Oct, 2011)

Differences What are the advantages of each

Front view of Sony Xperia M

Reasons to consider the
Sony Xperia M

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Supports NFC Yes vs No Somewhat common; Enables payment by phone and other wireless communications
Is 4G Yes vs No Somewhat common; Supports the fastest, most reliable networks
More cores Dual core vs Single core Twice as many cores; each additional core lets your phone do more without visible UI slowdowns and jerkiness
Records higher def video 1280 x 720 @ 30 fps vs 1280 x 720 @ Unknown 30x higher def video
Better theoretical download speed 21.1 Mb/s vs 0.38 Mb/s Around 55x better theoretical download speed; enjoy lightning fast downloads on modern networks
Front view of Sony Ericsson Xperia arc S

Reasons to consider the
Sony Ericsson Xperia arc S

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Faster processor 1.4 GHz vs 1 GHz Around 40% faster processor; run computation-intensive applications, such as photo editing, faster
Higher resolution front camera 8.1 MP vs 5 MP More than 60% higher resolution front camera; Video chat with other people
Slightly bigger screen 4.2" vs 4" More than 5% bigger screen

Reviews Word on the street

Xperia M  vs Ericsson Xperia arc S 

7.3
8.0
Video is fairly smooth at 30 fps, and the same good looking colors and fine detail are observed as in the stills, but we wish that the 720p videos were sharper.
Xperia arc S

6.0
9.0
The 720p video isn't amazing in terms of picture quality.
Xperia arc S

Overall

7.0 Out of 10
8.2 Out of 10

Specifications Full list of technical specs

screen

Xperia M  vs
Ericsson Xperia arc S 
Size 4" 4.2"
Resolution 854 x 480 854 x 480
Touchscreen Capacitive Capacitive
Multitouch Yes Yes
PPI 244 ppi 233 ppi

hardware

Clock speed 1 GHz 1.4 GHz
Number of cores Dual core Single core
RAM 1 GB 0.5 GB
Internal storage 4 GB 1 GB
Supported card formats
SDHC
SD

photo & video

Camera 5 MP 8.1 MP
Resolution 5 MP 8.1 MP
Flash Yes Yes
Video resolution 1280 x 720 @ 30 fps 1280 x 720 @ Unknown

cellular

Generation 4G 3G
Networks
GPRS (0.01 Mb/s)
HSUPA (5.76 Mb/s)
UMTS (0.38 Mb/s)
HSPA (unspecified)
EDGE (0.38 Mb/s)
HSDPA+ (21.1 Mb/s)
GSM (0.01 Mb/s)

battery

Talk time (3G) 540 min 456.6 min
Standby time 29,952 min 27,648 min
Standby time (3G) 27,216 min 27,648 min

form factor

Xperia M  vs
Ericsson Xperia arc S 
Weight 115 g 117 g
Thickness 9.3 mm 8.7 mm
Size 62 x 124 x 9.3 mm 63 x 125 x 8.7 mm

sensors

Has an assisted GPS Yes Yes

music

Supports FM radio Yes Yes

software

Operating system Android 4.3 Android 4.0
Multitasking Yes Yes
App store Android Market Android Market
Adobe flash support No No
App store size 850,000 apps 850,000 apps

connectivity

Acts as a wi-fi hotspot Yes Yes
Supports NFC Yes No
Bluetooth Bluetooth v4.0 Bluetooth
Sony Xperia M
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Sony Ericsson Xperia arc S
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