JEB
Legend
Volo's has more substantive lore for its monsters than MOTM, however. Plus expansion material for core Monster Manual creatures that didn't make it into MOTM. So I'd say it depends on whether or not you mostly want the statblocks for new monsters all in one place, or if lore material also has value.If you get Monsters of the Multiverse, you don't need Volo's. Multiverse is a combined Volo's Guide to Monsters & Mordenkainen's Tome of Foes - two books in one.
Also worth considering: Volo's (and Mordenkainen's Tome of Foes) are 100% Monster Manual compatible, but MOTM does change its approach to monster design a bit (most notably with spellcasters). (@Leatherhead is doing an excellent rundown of the changes in MOTM here.) Still totally usable together, though.
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