What is the difference between CAT TL and TH telehandlers?

[Felix Branairos]

I'm trying to understand the differences between CAT TL and TH telehandlers. Which models are built by JLG, and what parts does JLG actually manufacture?

 

[Denmark Arthurs]

I've always thought the TL vs. TH naming can be a little confusing at first. Curious to hear from folks who've run both, because real-world differences in performance and maintenance usually tell the story better than the spec sheet.