A humbly offer my professional advice.....
.... on this subject - I do this for a living - This recipe works best for me, (happy customers = good tips)3 parts gold tequila (not white, not anejo, the agave juice has to have a little bite. 1 part triple sec (generic okay, Cointreau es muy caro) 3 parts SUNKIST sweet/sour (this is the very best mix for margaritas, the consensus choice among most professionals. It is lemon/lime in taste, not too tart or lemony. Most importantly it provides a nice, creamy head when shaken.NO BLENDER..... ON and OVER .. Shake lightly with ice cubes in stainless shaker, then pour entire contents into KOSHER salt rimmed tumblers. If desired, one may shake more vigously for a deeper chill and serve "up" by straining contents into a Kosher salt rimmed martini style glass with just a few cubes to keep it cold. Garnish with lime wheel on rim, don't squeeze.