I started by loading ATV 5.3 & couldn't fault it, then loaded VIX 4 & have left that installed for now as the Edision supports ota updates for VIX plus it is supposed to be a little quicker than ATV however they both appear similar in speed so maybe VIX4 is a little more bloated? I haven't found any real reason to promote one over the other both are acceptable to me so it is personal preference. Its the Edision that has surprised me as it has won me over & is now my main box over my much loved zgemma's, Im still a fan of the zgemma but the Edision has the edge for me.