Tag VS Tag JR which one for a 2 year old?

so thinking of getting the Tag system for my 2 year old, Lorelei...should I get the Tag Jr or just the regular Tag system? I was reading and the Tag Jr can not read regular Tag books but the Regular Tag can read Tag Jr books.... a 5 year old I watch has a regular Tag and Lorelei can use it no problem...I have not used a Tag Jr...anyone with and thoughts?