Which is best for photos

I'm not sure if this should have been on the Hardware spot or here, but I am trying to decide between 2 computers which would be the best for working with my photos. I spend a lot of time with manipulating photos and want the computer which will do the best job for me. I have my choice, but don't know enough about what does what to make a decision. Here is the information I think is relevant. If I need more, please let me know.

Gateway
Processor AMD Athlon® 64 X2 3800+, dual core processor with AMD64 technology
• 2.0 GHz
• 200 MHz system bus
• 512KB × L2 cache
Memory
• Installed: 1024 MB DDR2 533 MHz (PC4200) (Expandable to 4.0 GB)
• Expandable to: 4 GB

Video Integrated NVIDIA® GeForce® 6150LE graphics
Up to 128MB of Shared Video Memory Audio Integrated 8-Channel (7.1)
High Definition Audio
Hard Drive 250 GB 7200 RPM PATA hard drive

Performance Rotational Speed 7,200 RPM (nominal) Buffer Size 2 MB Average Latency 4.20 ms (nominal) Contact Start/Stop Cycles 50,000 minimum Seek Times
• Read Seek Time 8.9 ms
• Write Seek Time 10.9 ms (average)
• Track-To-Track Seek Time 2.0 ms (average)
• Full Stroke Seek 21.0 ms (average) Transfer Rates
• Buffer To Host (EIDE) 100 MB/s (Max)
• Buffer To Disk 748 MBits/s (Max)

Sony

Intel Pentium 4 Processor 2.80 C GHz with Intel Hyper-Threading Technology
Cache Memory 512 KB Integrated On-Die Level 2
Front Side Bus Speed 800 MHz
1024MB PC-2700 333MHz DDR (expandable to 2.0GB)

Hard Drive 120 GB 7200rpm Ultra ATA.100 Hard Drive
Video & Graphics
ATI Radeon 9200
128MB Video Memory (128-bit DDR)
8X AGP 3D Graphics Hardware Acceleration

Thanks for any help
Peg