2007 iMac vs 2008 MBP

I need to solicit some advice about a little domestic dilemma we have about which computer to keep.

We have a 2007 2.4GHz iMac with a 1 TB HD (7200RPM), 4GB RAM and an ATI Radeon HD 2600 PRO with 256MB memory. And we also have a late 2008 2.53GHz Macbook Pro with a 750GB HD (7200RPM), 8GB RAM and a NVIDIA GeForce 9600M GT with 512MB memory.

The person using this computer does some casual and semi-professional video editing. Before investing in a proper rig for video editing, I want to be sure that this is not another passing fad (so please don't suggest a newer computer). If the Macbook Pro stays, it will primarily be used with an external monitor.

The main issue is performance. I suspect that the MBP will be the better performer, but there are other factors that may point in the other direction. Your advice please!

Intell said:

The Macbook Pro would outperform the iMac at nearly everything.

Click to expand...

This is more or less what I thought, but I wouldn't mind a slightly more detailed answer.

My thoughts are that the additional 256MB graphics memory, 2-4GB RAM (the iMac can take up to 6GB, it currently has 4), and marginally faster CPU in the MBP might just edge the iMac, but I wouldn't expect the difference to be significantly greater. Basically, the MBP might be marginally faster.