The Maryland is a colorado that can fit the trip 16s that the SoDak uses. The Indiana Is a SoDak that uses the NoCar guns. Maryland had a decent speed for me of 25/39 with AA and 3 Elite BVE engineers, The angles are the same as the SoDak so 40 degrees, which makes it very managable. Advantages the Maryland has over the Sodak is the Extra gun and support slot. The Sodak has considerably more speed than the Maryland, but my choice would be the maryland just because of the firepower. The Indiana Has a speed of 26/42 with AA or 26/44 without, which is the same as the Sodak, except it carries the NoCar guns, with an angle of 45 degrees and a slow muzzle velocity gives these guns an insane hang time. The Indiana is basically a very fast NoCar with an extra sailor slot.
Both ships are based off of the SoDak. the maryland being slower with and extra gun, and the Indiana only having the bigger guns. Spread is terrible for the NoCar guns (even with my Eltie ARA BVE lvl 95 gunners) so my pick would be the Maryland because its essentially a Mini Montana.
hope this helps