Nuchal scute which can -according to me- clearly be seen in the photo is absent in Chelonoidis and Cylindraspis, while only rarely absent in Aldabrachelys. The head is more pointed and higher in the latter. I guess you are right. So it is most likely an Aldabrachelys gigantea.
PS: I guess I reunited with my anonymous downvoter. I still wonder why and how, apostles of ignorance haunt even against solid scientific facts HERE in RG.
As brought out previously, most Aldabra tortoises (Aldabrachelys) have a nuchal scute (1.34% do not) and Galapagos tortoises (Chelonoidis) do not. The tortoise in the image appears to have a nuchal scute and thus most likely is an Aldabra tortoise.