In the Quest for the "perfect" smartphone, I have just received my new HTC 620 which may replace my actual Dopod 818Pro (HTC Prophet).

Basic comparison

Communications

• Prophet : 4-band GSM/GPRS/EDGE, Wifi 802.11b/g, bluetooth, IrDa
• S620 : 4-band GSM/GPRS/EDGE, Wifi 802.11b/g, bluetooth

Size

• Prophet : 108×58x18.2mm, screen 2.8'' 320×240, 65000 colors
• S620 : 111.5×62.5×12.8mm, screen 2.4'' QVGA

Processor / Memory / Battery

• Prophet : TI OMAP 850 200 MHz, ROM/RAM 128/64 MB, SD Card slot, Battery 1200 mAh
• S620 : TI OMAP 850 200 MHz, ROM/RAM 128/64 MB, MicroSD slot, Battery 970 mAh. 

Input Method

• Prophet : Handwritten recognition on tactile screen
• S620 : full 37 keys QWERTY keyboard with backlight

Operating System

• Prophet : Windows Mobile 5.1.195 (build 1487.2.0.0)
• S620 : Windows Mobile 5.1.342 (build 15097.3.0.1) with Direct Push Technology. 

First feeling using S620 after 9 months with Prophet

• S620 is slightly lighter and thiner than Prophet  
• Wifi link establishment is lots faster than with Prophet
• S620 uses WM5 software for smartphone, while Prophet uses WM5 software for Pocket PC.
• S620 uses the same ActiveSync version but cannot synchronize files (perhaps to test again with a MicroSD card inserted).
• Typing method lots faster with keyboard than with handwritting recognition
• S620 does not have predictive text input.

More will  follow based on day-to-day experiences but fell free to participate with questions & experiences.