Personal standpoint prefer close games even if it's sweep, because if it's like 4-1 after first period and something like 6-1 in half way second, might just well close the stream/tv and go do something else for rest of the time. 99% time there is no comeback from that, so watching rest is meaningless for me.
Meanwhile matches that are even/close to last second or go even OT there is whole a lot entertainment when you want to see which one comes out on top. Sure if it's match where both teams are super passive and scared/uninterested then it's boring too, but much less likely to happen in playoffs.