Each drug has a similar spectrum of activity with Albendazole being preferred for strongyloidiasis and cystic hydatid disease caused by Echinococcus granulosus, and each has low systemic absorption.
Taking a fatty meal with Albendazole helps with absorption.
The drug Mebendazole is metabolized to inactive products by the liver (cimetidine inhibits metabolism, but often this is not actually done), but the drug Albendazole is metabolized to the active sulfoxide.
Both are usually safe for short term use, but long term use might cause liver problems, leukopenia, hair loss, headaches and fever (at least with albendazole) . Both induce liver metabolism of drugs.
Sometimes with antiworm therapy it is a good idea to take antihistamines or corticosteroids to suppress the allergic reaction to dead worms.
Goodman and Gilman's Pharmacological Basis of Therapeutics, 11th edition, pages 1078-1083.