3x4x8 or 3x3x8 weight?

After going to the farm machinary show in louisville a lot of new ideas are going through my mind. How much does a bale of 3x4x8 or 3x3x8 square bales weigh if there pure orchard grass? they are 8' long right? Just trying to figure out if I rebale these how many small square bales I could expect to get out of them?

Also is there any reason to go for the 3x4 balers over the 3x3 balers?

3x4x8 or 3x3x8 weight?