Ok, as a owner of both devices decided to write some facts…

HTC Desire S – 115 x 59.8 x 11.6 mm, 130g

Samsung Google Nexus S – 123.9 x 63 x 10.9 mm, 129g

Both phones are  similar in design and belong  mid to high-end class of smartphones.As an diehard HTC fan I’d say the HTC Desire S is a nicer looking , but it’s a very close.

The HTC Desire S has the smaller of the two screens at 3.7″, it’s a  S-LCD capacitive touchscreen coming it at 480×800 pixels and featuring so called ‘Gorilla Glass’ display. Multi-touch input, accelerometer and touch sensitive controls, replacing physical buttons (imo physical buttons are better). As usual, the phone comes with the HTC Sense 2.1 user interface  onboard.

Samsung  Google Nexus S has a 4″ Super Amoled touchscreen, also at 480×800 pixels (this apply for GT-i9020 version.Mine is GT-i9023 and comes with S-LCD screen). The phone have a contoured curved glass display with an oleophobic surface. Multi-touch, accelerometer and gyro sensors along with touch sensitive controls confirming that the Nexus S is on pair with the Desire S .

The Desire S comes with 1.1 GB of ROM (onboard storage) with slot for Micro SD cards (up to 32 GB) topped with 768 MB of RAM.

Nexus S is equipped with 16 GB ROM (onboard storage) , RAM “stopped” at 512 MB. There is no card support on the Nexus S.

The Desire S is powered with a 1 GHz Qualcomm Scorpion processor  (MSM8255 Snapdragon) co-operating with Adreno 205 graphics processor (GPU).

Nexus S comes with ARM Cortex-A8 processor, clocked at  1 GHz (using Hummingbird chipset), coupled with PowerVR SGX540 GPU.

Both handsets are powered with single core technology .

Both phones have 5 MPx cameras, which is enough for average quality photos and video.

The Nexus S main camera has a resolution of 2560 x 1920 pixels, while video capture is 480p(WVGA). Autofocus, touch focus, LED flash and geo-tagging are there. Secondary camera (for video calling) comes with VGA resolution.

Desire S camera has 2592 x 1944 pixels,supporting image stabilisation. Video capture is capable of HD at 720p. Secondary camera here is also VGA.

Both handsets running latest version of Google’s Android OS (Gingerbread), Android 2.3.3 (on HTC Desire S) and Android  2.3.4 (on Nexus S) respectively, which is about as good as it gets for Android smartphones for now… With overall better performance, Gingerbread also features a more extensive app management (Gingerbread actively keeps controll on  running apps and if any of them are idle or use too much power  close them). Application management allow you to see how much battery power, processor power, storage space and active memory is being used by each  application.

HTC Desire S looks nicer and it’s power compared with the Nexus S is better ,(but as mentioned at beginning, I am a diehard HTC fan, so this is my personal opinion).