Personal choice I know some druids could beat a shaman in a duel but shamans are very vicious with dots. Both are pretty equal soloing. Druids will have a little better heals but shamans do nice
If you ever duo the shaman kicks the druids ass. Honestly the shaman is a better soloer once you hit 65 and get decent equipment and relics. The shamans 65 dots own the druids and can go longer.