I have both. I'm the bes admin for my company and have been given a 8830 to carry for work. I personally own a pearl.
8830 Pros
Better battery life over the pearl
very stable
Screen is bigger
My 8830 feels more solid than my pearl
I have less issues with running out of available memory vs my pearl
8830 cons
not able to recieve MMS messages
Pearl pros
Smaller form factor, nicely fits in pocket
Camera with flash and the quality is decent
MMS Messaging capability
I do like the keyboard and after getting used to suretype it can type pretty fast on it.
Pearl cons
I can only get 2 days max out of the battery
The phone locks up on me from time to time and I have to do a battery pull to fix it.
It runs out of available memory every once in a while and my sms and mms messages disappear when this happens. I bought a 1 gig memory card for the phone and this still happens.
I am experiencing this issue as stated at
HowardForums: Your Mobile Phone Community & Resource - VZW 8130 - Can't hear other person since upgrade
and am waiting for a software update to hopefully fix it.
The trackball "click" function quit working on my first pearl so it had to be replaced. VZW gave me a refurb phone which I know is their policy but makes me mad when you pay as much as you do for these.
CONS for both of them is they don't ring loud enough!!!!!!!