Compared to Tuckermans Ravine, how is the difficulty level of Boott Spur?

I'm climbing Mt. Washington NH for the second time this summer. Last year we took the Tuckerman's Ravine trail the entire way. This year we have a third person coming that isn't in as good of shape and I heard that the Boott Spur trail was a bit more forgiving on the knees. My question is for anyone who has done both Tucks and Bootts and if the Boott Spur trail is a bit easier even though it is longer and if it is easy to get to from the Hermits hut off Tuckermans or if you have to start on the Bootts trail right from the get go. I've tried searching the net, but not finding the type of details I'm looking for. Thanks.