I love bermuda grass for a warm season lawn that has the advantage of sun. I would advise anybody to stay away from Bahia. I am living in Winston-Salem NC, and no one here has ever heard of Bahia. Go a little further south around Columbia SC and below, and you will find it. It keeps out weeds very well, but it is one of the ugliest grasses I have ever seen. The reason is that it produces roots that make the blades space themselves widely apart that you can't ever get it thick enough to call it a turf. Some other lawns that have weeds between grass blades have the ability to tighten up the turf if you pull the weeds. Not Bahia. You will see sand between the blades. Is that what you want? I didn't think so. If you want proof, visit a lawn around Columbia SC.
Many reasions why I love bermuda is that it will tighten up and make a thick lawn. Crabgrass loves the sun too and it will grow around bermuda. You need to pull up the crabgrass and get the knots which form underground spreading their invasion around. The hairy crabgrass roots are shallow in comparison to Bermuda. If there is Bermuda near the area where you remove the crabgrass, it will invade the area previously containing the crabrass. That is how you can thicken your bermuda lawn. Bermuda roots are much stronger than crabgrass, and the crabgrass will have a tough time coming back, especially if you pull up the knots. And weed control is improved. I have found Bermuda to grow on slopes that other grasses will fail to spread. If you want some erosion control on slopes, Bermuda will do it as long as it gets enough sun. During the winter you can have an overseeded fescue lawn. Around here we can have 2 lawns in one, dependent on the season. And it keeps out the weeds too. But you need to fertilize the Bermuda to make it grow best. It has the highest fertilizer requirements of all the grasses I know of, and it likes it in liquid form that you can attach to a water hose and spray jar. Bermuda is also foot traffic tolerant, and you can walk on it all you want without damaging it.