SSL has 3 types: DV, OV, EV. Different validation and price.
DV
Domain only. Fast (10 min). Free (Let's Encrypt) or $5-30/year. Blogs, landings.
OV
Domain + organization. 3-7 days. $50-200. Mid-business.
EV
Full check: legal, physical. 1-3 weeks. $200-1000. Banks, payments.
Technically
All 256-bit. Difference is owner verification.