Yes, there are differences between the two.
In fact, these lines have different features for different users and needs. For example, the Pro 20 and Trick 25 have a greater elasticity and therefore require a greater body control. In other words, this kind of line is more suitable for those who have a bit of experience. On the contrary, the White 15 and Training 18 give more confidence and have a lower difficulty: that’s why they are ideal especially for beginners.
When you choose your Slackline, consider its main use.