Hi, PredaFran! Great news, my newest book should be able to help a little. It is now free on Amazon. It will atleast give you a foundations of things you should really think about when doing your comparison. Hey, when you're done reading it, if you don't mind, please let me a review!

The Ultimate Guide to Choosing a 3d Printer: How to Choose the Best 3d Printer

Thank you,
Elliot Simmons