LOL.
-Argus actually has a main story quest line, tons of lore, and dailies, TI did not(outside of the one for coins?).
-Argus actually has a dungeon on it, TI did not.
-Argus has an endgame progression system unlocked account wide, TI did not.
-Argus gated the content for 2 weeks(so long..), while TI required legendary capes to gain access to the world boss.
-Argus gear is hugely rewarding and easily farmable(the 880 pieces, equivalent to the BoA pieces from TI), and also has 910 gambling with huge payoffs. TI did not.
-Argus rares have 5 mana rays, 4 gnashers, and a talbuk, TI had a dragon.
-Argus rares have numerous toys, TI had a few(most things were not actual toys, but consumables).
-Argus rares have a few pets, TI had a shit ton(TI definitely wins this).
-Argus has a lots of unique wild pet models, TI had a few.
-Argus has 12+ difficult(for the most part) legendary pet battles(and hardmodes) with no lockout/repeatable, TI had the Celestial Tourney on a weekly lockout.
-Argus utilizes a ton of new art, beautiful backdrops, and three huge zones, TI was a tiny island with some new art, but mostly Jade Forest.
-Argus has what, 8 rotating world bosses? TI had 4 rotating world bosses+1 static(and they dropped PvP gear).
-Argus has invasions, another piece of daily content, TI had nothing.
-Argus has two reputations, with gear, recipes, tabard, numerous mounts, convenience items, toys, pets. TI had a single reputation that was awful to grind(honestly, it was) with a mount+pet.
Edit:
-Argus rares and treasure chests also reward unique mog sets for Plate/Cloth users, as well as something like 20 weapon mogs. I don't think TI had any.
-Argus has the eye grind, TI had the coin/frog grind.
-Argus rares are up for a set amount of time, allowing most people the chance to kill them and always reward currency+AP. TI rares you had to get lucky or get the timer addon to know when they'd be up and camp, and didn't have rewards outside of their pet/mount/consumable/etc if lucky.
So let's be real, facts are facts. Say what you will about how "hard" it is to get around(when its really not hard at all), but Argus blows the lid off of TI in terms of content. I liked TI, but Argus is infinitely better.