First thing to take into account is that those brands have different ranges depending on the number of handmade steps and quality of cloth used, and they are all neapolitan brands, so you can't really compare them to other brands, maybe with other italian shirtmaking operations like Maffeis, Fray and Gerardi, but neither with English nor French school of shirtmaking (very different construction and style).
As far as I know owning some of the mentioned brands:
Borrelli has three main lines: Royal collection, mainline and luxury vintage.
Barba has even more: Gold line, mainline and dandylife.
Finamore has at least three too: Esclusiva, mainline and vintage.
High end lines usually have more handmade steps and more expensive cloths (at least 8 handmade steps including buttonholes). They retail around 350€.
Main lines have some handmade steps (sleeves attachement, buttons, bartacks, sometimes collar...) Borrelli mainline has neither collar attachement nor buttonholes made by hand.6 handmade steps. Retail at around 250€.
Vintage lines use vintage/washed cloths and usually have less handmade steps (my dandylife barbas have only handmade buttons, sleeves, bartacks and gussets). 4 handmade steps. Retail at around 200€.
I would grade these brands at the same standard and they all would match Caruso, Belvest and Canali suits/sportcoats well.