As said, both will work very well

though Isocol is the cheapest and readily available including the local supermarket.
Another very cheap alternative is methylated spirits (98% ethanol) which is also readily available and is what I use.
Though not used like Isocol in businesses/practice as highly flammable hence the market for Barbicide.
If considering Barbicide and you have a mate working in a medical environment ask them about Glutaraldehyde. Similar price to Barbicide and easily more efficient. 2% Glutaraldehyde will disinfect any item completely.
Again nothing wrong with the above and all work perfectly and probably all you need. Just another modern option that is very effective to consider.
*Edit alcohol or Isocol shouldn't damage celluloid items. Acetone definitely will.