J'Zargo is a terrible mage. He is a mediocre follower at best; as a mage he is horrible.
His stats are pointless to deliberate. His AI is awful and he casts Sparks in combat, which is just worthless. He has high skill in Heavy Armor and 1-handed, but he usually defaults to casting, so even those are wasted. Have you actually used these guys as followers, or are you just parroting what you read somewhere?
It's hard to believe that anyone would say J'Zargo is objectively a better follower. You may prefer him, but he isn't better.
Marcurio's perk set would be solid for a PC mage; for a NPC follower that's amazing.
You are talking out of your ass without any information given.
He is BY FAR the best magefollower and yes I have tried all except for Aranea because I didn't chose her path. How is he a terrible mage? At least I have given some reasoning while you talk without providing any facts,You say he has high skill in Armor as if it was a bad thing lol? Yes, he has 96 in heavy (at lvl50) while Marurio also has heavy armor but only a pity 20 at max level. SO whats your point?
His stats are better. Marcurio has a higher manapool at lvl40 and thats pretty much it.H
Lets see Jzargo got ,100 1h, 100 destruction, 60 restro, 100 illu, 458h (717hp maxlvl), 295mp (450mp maxlvl) while Marcurio got 20 1h / 0 2H, 100 dest, 100 rest,425 hp 410mp.
And I dont know what you mean about his AI being terrible I have him as a follower and he doesn't spam sparks he actually uses all kind of spells depending on the situation like frostbolt/fireball/Steadfast ward etc.
Again, take whatever follower you like but don't make false statements. NUMBERWISE J'zargo is the BEST Magefollower ingame. By far. Period. I have provided enough numbers. If you don't like him fine. But don't claim things without any numbers.