[{quoted}](name=The Leo Cat,realm=NA,application-id=3ErqAdtq,discussion-id=mt7whzOj,comment-id=0003,timestamp=2017-08-10T14:47:15.841+0000)
I don't think a smite that gives you individual tankyness would be a good idea in the current meta. Tanks are already a bit overloaded at the moment.
But Green smite tends to be a good alternative for people who will normally take Red or Blue. Except for Lee Sin, he absolutely needs green.
Technically, Tracker's knife isn't a smite upgrade. It just tacks on a mini sight stone onto your Jungle item. And technically, Lee Sin doesn't need it. He could still get away with sightstone, which he used long before tracker's knife was a thing.
Personally, I think the Tracker's knife it superior in almost all cases. Aside from the fact that move vision is good. The Blue and Red smite upgrades become moot if your not using them against champs. While that may sound like a fair trade off for the enhanced smite, I simply find it better to make use of smite to enhance clear speed. (And if I'm using it on clearing faster, I won't have it available for ganks.)