"Many different opinions" is an understatement HJere's one more .... keep it simple ... test to see if the broadhead flies well .... 125 gr. .... a reputable 3 - blade is a great place to start ... mechanicals are not necessary. Consistent straight flight and excellent penetration are the keys. Specific recommendations ..... NAP Thunderhead, Muzzy 3 blade, Montec G-5 3-blade. I have used all three and these have been excellent.