Tusks has better typing and coverage, offers a lot more offensive presence and its main attacking move isnt just EQ. It can easily turn into a wallbreaker/set up mon with bulk up, rapid spin and/or protosynthesis.
It also offers more utility thanks to SR, Knock off and Spikes.
What does landorus offer? Ground inmunity? For what? Shitty coverage and a x4 weakness? At this point just slap pair tusks with a bird and call it a day.
My brother in Christ, what are you smoking? Are you playing DLC2 before everyone else and you're spoiling the new moves or something? Great Tusk does NOT get Spikes. Also no, Landorus has actually a better typing both defensively and offensively (the latter in theory). Defensively Lando offers an immunity to 2 very valuable typings (Ground Immunity for what? Are you serious right now? Do you play the game? And have you heard of Spikes?), and it's only weak to 2 typings, one of which being a 4x weakness to Ice (which does
not make a mon bad, just look at fucking Gliscor). Ground-Flying also offers a valuable resistance to Fighting, which is a very common offensive typing, therefore making Lando resist both of Tusk's STABs. Landorus-T also has Intimidate, which is probably one of the best abilities in the game. Tusk on the other hand has 6 weaknesses, two of which are the same as Lando (and with that SpDef I guarantee you ain't surviving a single Ice Beam in the game coming from a decently strong Special mon), and two more in particular being Grass and Fairy, the latter of which is especially important. Now offensively, Lando actually has a better typing still, since Ground-Flying is resisted only by 17 mons (in the entire game) and hits 50% of the metagame supereffectively, while Ground-Fighting is resisted by 155 mons (13%), and hits 43.4% of the metagame supereffectively. Now, the reason why Tusk is better offensively is that it has better coverage with Knock Off (which Lando used to have), Ice Spinner and Play Rough, and it has VERY strong STABs with Headlong Rush and CC. Lando on the other hand lacks an actual Flying STAB move besides Fly, but it could solve this problem with Terablast (although it's true that this isn't optimal), it only has EQ (which is still a good move) and no longer gets Knock Off, but compensates with the presence of a valuable pivoting move in U-turn. Landorus also gets a strong Rock type coverage in Stone Edge, which allows it to hit Flying-types more effectively due to its superior base Attack. For this reason Lando functions as a better Choiced mon, but Tusk is a better potential sweeper between Rapid Spin and Bulk Up (Lando gets SD but can't do anything about its Speed cause, you know, it got nerfed and no longer gets Rock Polish).
I agree that Tusk is the best mon currently, due to the insane nerfs Lando has received, but your post is simply idiotic when you consider the crazy stuff you've written.