I would try to avoid deworming birds during moult if possible. Moulting is stressful to birds and it is more important to make sure they are getting enough vitamins, minerals, and amino acids since much of their energy stores can be depleted. Spring and Late Fall is when I usually witness moult.
If one needs to worm birds during moult, Avioworm or Coxiworm are the best options I know of:
Avioworm: http://www.jedds.com/-strse-1789/AVIO-WORM-POWDER-100G/Detail.bok
Coxiworm: http://www.jedds.com/-strse-1781/AVIO-dsh-COXIWORM-TABLETS/Detail.bok