I was wondering that too. Automatics are an engineering wonder, but then again, that display back on the manual wind is a sight to behold. Would the manual wind "moonwatch" be considered more rugged? Are autos more delicate?
I don't think any one type is more robust than the other.
The " must have " Speedy for enthusiasts is the manually-wound Pro model as you probably know primarily die to its' associations with the time-honoured historic and original editions. There is one exception - the 376.0822 which is often referred to in some circles as being the " Grail " Speedy.
I never gave a second thought for the manual winding watch before but now would not consider anything else. The display back is such a bonus of course but the inherent magic of the Professional model is all there, in all its' various guises in its' evolution to date.
If you want the " real thing", the blood relative of the watch that went to the moon, walked in space or which helped in the safe return of the crew of Apollo XIII, there is only one " type " to get - The Speedmaster Professional.
You'd need to consider the size factor as well Mr Edge if this is a material consideration. The autos range from 36mm which is the Reduced model to 40mm which are the current Date and Day/Date variations. The Speedy Pro is 42mm.