lenovo. replaced my old dell precision laptop with a T480 and I'm loving it.

dell pros:

• fast
• solid gpu for the time
• clean look
• came with linux.

dell cons:

• battery swelled up, made the trackpad and keyboard not work. replaced the battery a lot.
• keyboard wore out well before lenovo
• chassis screws fell out and then the hinge broke as a result. this is not a thing with lenovo.
• front edge was too sharp and slightly cut into my wrists. not a show stopper but annoyed me the whole time I owned it.

For your situation 16G may be adequate. But 24 is better.