Brio (never tasted it personally) is said to be quite unlike chinotto (too much sweet), personally even the San Pellegrino made one is a bit too sweet, in Italy there are quite a few almost artisanal brands that are usually much better (in the sense of being more similar to "traditional" chinotto) but they tend to be marketed nowadays as "niche/luxury" and have hefty prices.

What you can do (at home) is to make it yourself, there are good chinotto syrups and you just add sparkling water to make a chinotto that is better than the pre-made soft-drinks.