Orthogonal to escaping, the choice is what characters to use for unit separator and record separator.
If the data are for machines only, then for me the choice of characters doesn't matter. If the data are potentially for reading or editing, such as by a programmer, then my choice is to prefer typically-visible characters over typically-invisible characters and/or zero-width characters (e.g. ASV a.k.a. DEL a.k.a. ASCII 30 & 31).
My choice of USV is thus because U+241F and U+241E are visible, and also in Unicode they are semantically meaningful.
