Unless it says "Single Barrel" then technically it's most likely a blend.
Even though a product comes from a single distillery and from the same batch, multiple barrels are dumped into a vat before bottling, hence the technicality of being blended.
Most folks think of a blend though as something like a Jim Bean White Label, Maker's Mark, Jack Daniels, or a Johnnie Walker where multiple styles, years, proofs, etc. are blended by a master blender (and team) to come to a consistent tasting product over the years.
Advantages to both but it's all personal based on your taste preferences.
All this is what I "think" I learned from listening to WhiskyCast (https://whiskycast.com/
) for years before my liquor budget turned into my things (think diapers, toys, etc.) for the kids budget.