I can truthfully say that I have never run a battery down with either MK or MG. I do, however, charge my batteries nightly as I am not a tournament fisherman.
MG does have Heading Lock & Cruise Control. I have used both sparingly but both have worked well..
Like gene said, we both are brush pile & dock fishermen and you just can't beat MG's Anchor Lock. Not at the present time anyway. I'm sure that MK will take care of their Spot Lock problem soon.
If you Spider Rig, Longline, crankbait puller or pusher then MK would be good for you. MK is a quality product with one shortcoming.
USS Intrepid CVS-11 Helicopter Squadron-3 1960-1964
When I keep my gratitude higher than my expectations I have a good day