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Is this so? My understanding was that they are both ways of simplifying loose tenon joinery (and within that, that dominoes are geometrically superior due to width, snugness of fit etc but that they are essentially using variations of the same mechanics to join?)
(Not being snippy - hoping to be set straight by someone with more knowledge than me if I’m miseducated!)
kkg337-
No you are right.
Biscuits do add strength to an end grain joint and would add some strength in this use case. However I don’t think many people would just glue a shelf to the uprights of a bookshelf. The fact they swell up in their pockets mean they hold the sides and shelves together and help stop them walking apart. I just wouldn’t trust them with the weight of books etc in a downward pressure. But I’m up for being corrected myself, every day is a school day.
Chaley
Biscuits offer no strength in a joint and only help with lining things up and keeping them in place while the glue dries.
Although dominos offer strength, they are after all just oval dowels, I’m guessing https://www.dm-tools.co.uk/Festool-576427-240V-Domino-XL-DF-700-EQ-PLUS-Jointer-and-DS-XL-D12-D14-Domino-Assortment/P12810 ££££!!!! is enough reason to just use a router.