question on difference between Totem of chemelian and jaguarFollow

I have two totems. A level 40 totem of chemelian which gives invisibility and a level 30 totem that gives both invisibility and stealth. The level 30 seems better but is a lower level. Which is better?

Also, When do we get a new tradeskill after level 40?

Yes, as we go up in levels, tradeskill folks get new arts to limit problems while crafting such as scribing etc. When is the next art given after level 40?

Ah, those! You get new arts at 2, 10, 20, 30, 40, 51, and 61.