Difference between Reseller and Dedicated Hosting?

Hey there,

I'm considering moving my 70 clients (in my cPanel/WHM reseller account) to HostGator from a very bad web host (WestHost.com). I was wondering - would you recommend a dedicated server for my clients or should I choose the Diamond Reseller one? I see that both offer cPanel/WHM which is what I want. I'm not some network admin guy - just a web designer that likes to edit my websites in SSH using the vi text editor (love having root access via SSH). What makes the Dedicated plans more expensive than the Reseller plans?

Thanks in advance!
-Wes