D610 vs D620

We have purchased both systems at my work and they are both really nice. The 620's seems to have a wider screen and duo core processing = less heat. You can't go wrong with either of them really.....

"Better" is a relative term.  For best results, you might substitute "closer to state-of-the-art."  I wouldn't presume to speak for anyone else, but the communications specifications (particularly the Wireless sections) for both models are all I need to see to persuade me that I'd rather have the D620.

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D610: 

Communications
 
Modem:
Type
 v.92 56K MDC (optional)
 
Controller
 softmodem
 
Interface
 internal AC'97 bus
 
Network adapter
 10/100/1000 Ethernet LAN on system board
 
Wireless
 internal Mini PCI Wi-Fi (802.11b, 802.11b/g, or 802.11a/b/g) and Bluetooth® wireless technology (optional)
 
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D620: 

Communications
 
Modem:
Type
 v.92 56K MDC
 
Controller
 softmodem
 
Interface
 internal Intel High Definition Audio bus
 
Network adapter
 1 Gb Ethernet LAN on system board
 
Wireless
 WLAN card, wireless switch with Dell™ Wi-Fi Catcher™ technology, internal card with Bluetooth® wireless technology, and Dell Mobile Broadband card.

NOTE: The availability of the Dell Mobile Broadband card may vary by region.