The June 2015 issue of Family Motor Coaching Magazine had an article on Chassis Battery Charges. They reviewed a few products along the line of AC and DC chargers. Both chargers above were mentioned as well as the Echo Start from Xantrex.
One thing the article points out is that Amp-L-Start has over voltage protection whereas Trik-L-Start does not.
For FMCA members the article is located here.
Chassis Battery Chargers