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The difference is simple.

Aql (intellect) is deductive logic ege.g. you start with a general law from the Quran or sunnahSunnah, then deduce a new ruling on a specific example that is covered by the general law.

Qiyas is inductive logic, this is where you start with a ruling, try to guess the general law, then apply the general law to a new specific case.

Shia reject qiyas as in fiqh the mujtahid (clergyman practicing religious jurisprudence) must have certainty, qiyas can never lead to certainty, therefore useless.

The difference is simple.

Aql is deductive logic eg you start with a general law from the Quran or sunnah, then deduce a new ruling on a specific example that is covered by the general law.

Qiyas is inductive logic, this is where you start with a ruling, try to guess the general law, then apply the general law to a new specific case.

Shia reject qiyas as in fiqh the mujtahid must have certainty, qiyas can never lead to certainty, therefore useless.

The difference is simple.

Aql (intellect) is deductive logic e.g. you start with a general law from the Quran or Sunnah, then deduce a new ruling on a specific example that is covered by the general law.

Qiyas is inductive logic, this is where you start with a ruling, try to guess the general law, then apply the general law to a new specific case.

Shia reject qiyas as in fiqh the mujtahid (clergyman practicing religious jurisprudence) must have certainty, qiyas can never lead to certainty, therefore useless.

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source | link

The difference is simple.

Aql is deductive logic eg you start with a general law from the Quran or sunnah, then deduce a new ruling on a specific example that is covered by the general law.

Qiyas is inductive logic, this is where you start with a ruling, try to guess the general law, then apply the general law to a new specific case.

Shia reject qiyas as in fiqh the mujtahid must have certainty, qiyas can never lead to certainty, therefore useless.