The former. The latter wasn’t really independent - and recent US political history would be quite different if it were. (Can you imagine if the GOP and a separate “Tea Party” had separate parties and then ran different candidates in the general election?)

The one time I can like FPTP - if this happens in the way that I want (with the GOP basically splitting) then it’d likely mean many more Dems wins across the board thanks to the conservative vote getting split.