Mitchell, the advice folks are giving is sound and worth sincere consideration on your part. Both these breeds are really not "easy", they will challenge you as alpha and you need to know how to handle it without turning the animal against you. The destruction a mal, or giant mal is capable of doing is unbelieveable. I can't speak for the other breed you are considering.
Being prepared to groom a mal/giant mal is almost really the easy part, it is a commitment, but not difficult compared to the other challenges you would face. The hardest part would be dealing with temperament issues and these breeds you mentioned both need a "job". They need to have a purpose in addition to the purpose you may see in your mind to be your buddy and best friend. Can they do this, yes they can, but only if you really know how to handle them with respect to training.
I have not done much research on giant mals and hopefully our mal member can share in the discussion, but I do know there was some kind of M-Loot genetic thing, I know little about that, but I think(don't know for sure) that is how we have come to have giants.
Honestly I am used to handling mals and I am not physically a light weight, but a "normal" size mal properly trained can weight pull over 3,000-4,000 pounds, as can a giant mal, and perhaps they could pull more weight in proper condition. I can tell you I was unprepared being a person who has shared life with 7 siberians, for the difficulty I had my first time I tried to walk a giant mal into a convention center for a show. The gorgeous boy started booking and the next thing I knew I had done a face plant on the asphalt. I quickly realized I was going to have to take control of that situation or he was going to turn me into a mahed potato. Till we got the 200 yards or so to the convention center he and I had come to an understanding. It was after that experience I never again underestimated a malamute. Shoot my siberians can pull 2000lbs. in weight pull, and I have had them yank me off my feet when I was least expecting it.
Please give careful consideration to your choice and I have found it to be quite helpful to go to at least one obedience class when taking on any dog. Along the way I have had to go back to obedience classes to learn how to handle different dogs within the same breed