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Well now that we have digressed from the Aqualung v. ScubaPro query posed by the OP to a Hog, Atomic melee, why not open the floodgates to allow entry of any off-topic regulator? Poseidon, Sherwood, La Spirotechnique, Mares, Cressi, Apeks, Beuchat, Dive Rite, hey the barn door is open, why not even suggest some of the discontinued brands such as Healthways, Voit, US Divers, Dacor......
The OP specifically asked a question concerning opinions on only TWO regulators: The Aqualung Legend LX and the ScubaPro Mk25/A700. IMO both are excellent warm water regulators that surpass the needs of the recreational diver (130 ft maximum depth). You can't go wrong with either regulator. The A700 will be less prone to giving you "cotton mouth" as it is a metal second stage, neither regulator should be purchased solely because of the "free parts for life" gimmick, as others have pointed out, because of the required annual service intervals and/or purchasing of other equipment for eligibility is a means of having you pay for the "free". Get ahold of both regulators (hopefully side by side at a LDS who distributes both brands) and go with the reg that you like best in terms of features and style. Both brands are serviced world-wide, both have reputations as being "bulletproof" and both are benchmark standards for others in the industry. You can't go wrong with either.
If as you mentioned in your addendum, you are a cold water diver, then consider the Supreme version of the Legend and the Mk17 version of the ScubaPro as these are the environmentally sealed first stages needed in order to dive in water below 10 degrees Celcius.
AFAIK all legends have sealed 1st stages, the supreme has a silly "lip shield", cant imagine how much difference that would make and the ip is set lower from factory.
As others have said you won't go wrong with either and I doubt you could tell he difference in a blind test. As USdiver1 has posted the MK17 1st stage would be better than the MK25 if you dive cold water. Good luck.