It's better to use 1 address for staking or just like before the POS fix use many addresses with smaller amount?
Since the PoS reward glitch has been fixed, it no longer makes any real sense to have several hundred addresses. Regardless of whether you stake with one input or with 100 inputs, the PoS interest rate is the same except the negligible fees..
So you might as well consolidate all your DNR into a single input once every couple of days or similar, IMO.