Just purchased a canon 350, on the spec sheet it says it takes CF I & II type cards.

My Question is with the:

Sandisk Ultra II : write 9MB/sec, read 10 MB/sec
Sandisk Extreme III: write 20MB/sec, read 20MB/sec

Is there any advantage of using the Extreme or will it only preform at the Ultra level in the Canon 350 DSLR??