First, I don't think you are ever going to get your hands on a Saddle Back Galap. There's pretty much one or 2 forms available and if you follow Dr. Prittchards taxonomy, those are pretty much all 'mutts'.
Galaps are more personable out of the egg but they are different tortoises.
Aldabs are usually more active. Captive raised Aldabs can be conditioned to be as personable as a Galap. They seem to be born with a kind of flighty defense mechanism and they need to develop 'trust'.
Aldabs are much easier to come by considering they are only app II by virtue of being a Tortoise.
If I had a choice between the Aldab and the Galap and they were both as easy to obtain, I'd go with the Galap (but I wouldn't give up on the Aldab.
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Ed
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Trying to keep the fun in Chelonian care