There is no argument, you must get the Mac.
Although this is a PC Forum, almost everyone is sensible enough to accept that each system has it's strengths and weaknesses. This area is on the side of the Mac's strengths.
There are possibilities of Conflicts between the Dell and your Software.
There is one problem as far as I can see. The Review is discussing the Software's performance on a G4. Neither of the options that you have mentioned can match that machine.
Is there anyway you can skip the Laptop Option and head for either Desktop Option as you would get a higher specification for your money.
If you are going to be working with Video/Movie material then specification is very important. You will also find that a second Monitor will make all the difference to that ease with which you can work. (that might not be possible with the Laptop option)