What text comparison software do you use?

I've only had exposure to Beyond Compare and would like your opinion/suggestions on what's good.

mostly, I use it to compare two different versions of similar csv and potentially to merge them. Next use case is to compare two versions of simple scripts to see what's been updated.

Command line tools are a little too much for me, but if it seem to be very important to learn I supposed I could be encouraged to do so.