hello friend, how are you, migrating between odoo versions is a good decision as long as you check the pros and cons. The first thing you should take into account is that odoo improves and covers the so-called bugs, that means that if you customized some things, odoo can already have them ready for new versions, such as the credit quota in version 13 was not ready and version 16 is already there, if you want to change the odoo version the only thing I recommend you to evaluate are those developments or customizations made and know if they need updating in the code to be able to work in the new version,

Saludos, espero que te sirva mi comentario.