Fear Factory was kinda like my "gateway drug". It was the first non-mainstream metal band I didn't hate on first listen.
I have their 90's era albums. I've been meaning to catch up with their later releases.
I also have Plastic Planet. Way different for Geezer, but I like it a lot.
Definitely try out at least Mechanize of their recent albums. Heavy album that has its elements of the 90s era.