Selling first is the lower-risk path financially. You know your net proceeds before committing to a new home, and you are not paying property tax and a mortgage payment in two places at once, since the City of Saskatoon's tax cycle does not pause for a move.
Selling after gives you room to fix up the home properly and negotiate a possession date that suits your actual moving schedule, but it usually means bridge financing or carrying two homes for 4 to 8 weeks, and a lawyer should review any bridge loan terms before you sign.
There is no single right answer, only the one that matches your equity position and your risk tolerance for carrying two properties. Get your hand-reviewed valuation from Joel Dyck.