I agree with the post above by paulp 1960. Rather than list the 10 top reasons to upgrade from GB to Logic Pro X I'm including a link that lays them out better than I can.
https://www.macprovideo.com/article/...to-logic-pro-x
While Logic Pro X involves a steeper learning curve I believe you'd soon come to terms with it and appreciate the benefits very quickly. Besides, the journey is part of the fun!