Only a small section of BB is reservable. It is a loop next to the river that flows out of the lake. You may or may not get a site next to water. The best sites are non reservable and are first come first served and people go to great pains to "save" the primo sites next to water. They will get there a few days early and pitch an empty tent on a nice site next door that is never used other than to hold the site for a buddy. Shouldnt be allowed IMHO.
I have driven through Hochatown and it is a nice park. Can't remember if there are water side sites. Seems like there may be a few in spots, but can't be certain. Again, I think first come first served there as well.
I love Beavers Bend and have been going there for years.