I am missing your main requirements to the laptop. I would rather list them up in first place and then decide what you need.
Dell also has nice alternatives to the XPS series. The precision mobile workstations can be upgraded to 32 and even 64 Gb.
Dell also has nice alternatives to the XPS series. The precision mobile workstations can be upgraded to 32 and even 64 Gb.
I also recommend these Dells.