Which medication is more for letting blood pressure inderal (propranolol) or atenolol ?

Letting?: Not sure what you mean by letting, but I'll assume you mean lowering. They are both beta-blockers, so same class of meds. Both work about equally, depends more on the person. But they are not ideal blood pressure meds. Especially in a young guy, they can cause erectile dysfunction, mood changes and general fatigue.

Bets blockers: They are both beta blockers with same action on BP. Their pharmokinetics are different. Inderal (propranolol) is shorter acting.