Between the two, i'd use donahoe, and get full leaves in the rear rather than add-a-leaves... It'll ride/articulate better.
been rollin on Donahoe coilovers, deaver 8 leaf packs, and donahoe rear reservoir shocks for the past 2 years... no issues with them, and that includes a 72 mile daily commute, and offroading at least once every other month...
i also huck the thing...
as for customer service, i had to take em in for a recharge and they did it for free...