which T14 to buy

I am looking for a Laptop for Uni and have heard that Thinkpads are a reliable choice. I probably won't need to run any big programs on my Laptop, but I want one that is transportable and has a decent battery time. From what I have learned, a T14 is a good choice for my needs.

This leads me to my question: Is a t14s g1 with an amd ryzen 7 pro 4750U, 16 gb ram, and 512 Gb ssd, for 300€; or a 14 g2 with an i5-1135G7, 16 gb ram, and 256 Gb ssd, for 270€ better?

Otherwise I also saw a deal for a t14s g1 with an i5-10310U, 16gb ram, 256 Gb ssd, for 200€, but I am not sure if that maybe is a bit too weak

All of these are used, but have been refurbished

Also, is it possible to install more ssd on these Laptops?

If you have another reccomendation for me, please feel free to tell me