Matrix/Cromor is kinda like the wall thicknesses of an SL tubeset with an SP downtube and chainstays, which was a popular way to make an "SL" bike stiffer. And it mimics what Bianchi tended to do with their special Columbus mixes. You can see the exact specs here:
https://www.equusbicycle.com/bike/co...umbuschart.htm

Matrix is standard chromoly rather than the nicer Cyclex alloy, and it is seamed tubing other than seamless. Except for some particular tubes models (like one True Temper made in the '80s), seamed tubing doesn't cause any problems and chromoly lasts just as long as Cyclex in these wall thicknesses, so Matrix isn't as nice a tube as SL/SP, but not in a real important way.

Ciocc is a very high quality brand that has a real following. Bertoni is a value brand. Both were made by Italians. None of which can tell you anything about the actual quality of the frames, but the Bertoni is less likely to have hand thinned lugs - for instance. Both should be competently brazed, designed and painted. But the comparison is more like the difference between '80s Serotta and Trek steel frames.


Not knowing what size, which 105 components you have, how much you weigh or anything else, it is hard to say whether a Veloce/Matrix bike is an improvement over an SL 105 bike. But I would stop riding the Ciocc with kit gloves and really see what it can do. SL is thicker walled and stiffer than Tange Champion #1 or Reynolds 531c, so you don't exactly have a noodly frame with SL.


Road Test/Bike Review (1988) Affordable Race-Worthy Bikes (Bertoni, Miele, Peugeot)