My experience with Dynabeads is that they do work, but only if one is the sort that is not too picky about tire balance.
With them, once the tire and beads have reached their critical rpm, the nastiest imbalances will be dealt with; however you will not get that silky smooth ride that is possible with "real" balancing. I find this to be especially true at highway speeds where wind buffeting and the road surface mask the poor balance--at such speeds the difference between beads and proper balancing is quite noticeable.
I have also found that after 10 to 12k miles some beads will disintegrate and turn to a fine powder that no longer behaves as do the intact beads, negatively impacting the dynamic balancing process. More miles makes this worse. Dismount a "beaded" tire with 15k on it and you can see this.
As to which is "easier" it is of course using the beads. However proper balancing is not that arduous a task and generally in life the "easiest" way of doing anything is often not the best way...