A home inspection, typically $400 to $600, is a useful gauge either way, since it tells you whether the issues are cosmetic clutter a cleanout solves or structural problems a flipper is specifically priced to absorb. Comparing both paths against the Saskatchewan REALTORS Association's recent sold comparables in the same condition tier is the only way to know which nets more.
Selling as-is to a flipper trades a lower price for speed and simplicity, no cleanout, no repairs, no showings, while cleaning out and listing on the open market usually nets more money but takes longer and requires some upfront effort from the family or estate.
Which trade makes sense depends on your timeline and how much work the family is able to take on. Get your hand-reviewed valuation from Joel Dyck.