I cant offer advice about those specific models of Mobo's but I can speak on my experience between MSI & Gigabyte.
I went with MSI on my 1st build, 2nd and 3rd, solid as a rock! No problems whatsoever and they are still all running (family donated systems) On my 4th build I decided to go w\ the long anticipated Gigabyte 8inxp. It sure has not impressed me and especially at $255 I paid for it.
I have cold boot problems with the 8inxp and reboot problems... and the Gigabyte tech service sucks. I emailed them many times about my issues and they still have not replied back. I finally gave up. The system runs ok after it boots up but it's sporadic on the cold boots & reboots. Might work fine 3 or 4 boots in a row and then the next 2 or 3 times it wont boot and you have to shut the power off and try agn, or agn until it will come up.
There's a simple fix for it probably but I had even posted here about the problem and didnt get any feedback so I just live w\ it, but I doubt I'll buy Gigabyte agn.
As far as MSI tech support goes, I dunno, never needed them. Hmmm! :light: