I have no idea which board is better. They are probably similar performers. MSI has OC genie for easy OCing and EVGA looks pretty and is suppose to be an excellent brand.
About the 1366 platform.
Due to the Hyper Threading the 900 series has it seriously out performs any other platform except the LGA1156's 800 series in video encoding.
(
Video Encoding Graph of CPU Performance)
It also has the potential for future expansion to the first few 6 core chips while the LGA1156 platform is probably dead or nearly so.
If you plan on OCing at all I think you might as well get the 920 as it will probably OC to the same level as the 930 or nearly so.
That being said:
The 930 may prove to be some kind of unexpected monster OCer that has an unlocked multiplier or something, or like a x4 turbo boost...but probably not.
Considering they look to be at the same price point you might as well get the 920.
If video encoding is only a hobby and the ABSOLUTE BEST performance is not necessary you may want to consider the i5 750 which is on the LGA 1156.
The i5 750 runs about 80 bucks cheaper and for almost all applications it runs equal, and sometimes better, than the 920.
You also save on RAM since you only need to fill 2 channels rather than 3 channels.
Check out this link for i5 and i7 performance graph
Of course like I said before the LGA1156 is supposedly a dead line so there won't be any upgrades possible.
That's all I got
edit:
OK so it seems the actual URL's are too long to be inserted into the link. Here they are in plain text.
i5 vs i7 review:
www.hard ware canucks.com/forum/hardware-canucks-reviews/22151-intel-lynnfield-core-i5-750-core-i7-870-processor-review.html
Video Encoding page:
www.hard ware canucks.com/forum/hardware-canucks-reviews/22151-intel-lynnfield-core-i5-750-core-i7-870-processor-review-15.html
2nd edit:
Apparently Tom doesn't like Hard ware canucks because they erase it from the hyper link.
I put spaces inbetween the words but it should all be one word.