Well, you can either hold the property in an entity (LLC), or as an individual/trust. That's pretty much it (although I'm sure someone will chime in with some weird way they're doing it :)).
LLC's don't get the same term individuals do. In MOST cases (again, MOST), entity's get about ~1% worse interest, 20-year amm at most, and a 5-7 year call. You also still have to do a personal guaranty, again in most cases.
As to whether or not you hold the property as an individual or in an entity, there are probably thousands of posts already with wildly differing viewpoints. Some of it is opinion and others based on your situation. There is no default answer, unfortunately. Your best option is to explain your situation in great detail and even then, your responses will be split as to which way you should go.
One thing I will mention is that once you become a powerhouse with the number of units you have, you may have more leverage over the banks. Even at 42 units now, I don't really see that benefit. Maybe I can get a quarter or half point better on the rate than I could when I had less than 10, but that would be the extent of it.