so what is the best balancing method

Also it depends on the style of wheel, traditional steel wheels can be balanced with hammer on weights on both inner and outter lip or set up for the weights to be placed only on the inside lip, now your machined lip wheels that have a flat outter lip and a curved or hammer on weight type inside lip can be balanced with sticky weights or a combination of hammer on and stick on weights,
Your wheels that have a inner and outter flat lip are made for sticky weights only weather it be on both the side behind the spoke and the inner side or just on the inner side,

Traditionally a good balancer should first off be recalibrated at least every couple months
(Some on the fancy newer ones dont require calibration) but a traditional spin balancer should do fine, however for the best balance i would try to find a shop with a road force balancer.
Call around to the local dealerships and see if they have one, an expirienced tire technician is key also there are at least 8 different style of hammer on weights that fit different wheel lips, if incorrect ones are installed they may become loose and come off resulting in a out of balance tire