Yes, they are 2 different companies but owned by the same parent company (hence sister companies). At the time, I wanted the Havocs and hadn't seen the Nfabs, it was the Havoc rep that told me to buy the Nfabs because they weren't sure how long the Havocs would be on backorder (and about them being the same step design). Lifetime warranty would sell me on the Nfabs over the Havocs.
Yes, the Westins are an entirely different look. I read about some Nfab quality issues (at the time) and widened my look. Got down to the Westins and Magnums. The Westins have some of the biggest steps of any step rails on the market (front steps are a little over 15" wide, back over 11" wide). Then I found them on Amazon, and between the Amazon deal and a $33 Amazon gift credit I had, I saved $100 over retail. Sold. And honestly, I really like the Westins.
I also like the Nfab/Havocs and hope you enjoy yours!