If you want to dominate your market, you need good data. PropStream is the best I've found.
What you get:
Nationwide property data — ownership history, liens, equity, mortgage info
Off-market list building — vacant, pre-foreclosure, absentee owners, and more
Comps that are actually accurate
MLS data + public records in one place
I pair it with DealMachine for skip tracing. That combo is hard to beat.
Try PropStream here (trial link):