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They are both underpowered machines, but the second one isn’t even worth consideration.
For photo and video editing, I suggest a better and more powerful machine than either of the two above.
CPU speed and memory are both important.
Also, get the 64-bit operating system to fully utilize your system.
A dual core machine is not at all like a single core at twice the speed. For some tasks it is much more effecient (such as virus scan while simultaneously performing another task) while for others you may not get much of a performance boost. It also depends on if the program is written to use multiple cores.