Should I get the idiom or the pick up line tree for Spanish?
at level 6, odds are neither are going to help much. they will probably be more confusing than helpful due to their complex structure.. but if you're the kind of person that can memorize large chunks of text without needing to know the grammar, all power to you.
I'd advise not to get either until your farther down the tree... I'd say once past the third checkpoint. I got both right away and have regretted it ever since. I'm not saying they aren't interesting later but they do inhibit learning the basics... especially the ridiculous idioms.