I do not know what you mean by "Italian square sinks" or what you mean by "regular". Could you be more specific, or even better, provide a brand and model number. Perhaps you mean rectangular vs. D-Shape? If that is what you mean, then the benefit of a rectangular sink over a D-shape is that it is a more efficient use of space. A d-shape cuts into the interior space of the sink because of its rounded "D" corners. Having said that, many prefer the aesthetics of a D-shape sink. Also rectangular sinks come in "0-radius" or slightly rounded corners (like 10 degrees). The "0-radius" is a modern look but some complain that gunk can get into the sharp corners. I myself have a rectangular sink with slightly rounded corners and I like it a lot.

As to drain location, what you are talking about is called an "offset drain". An offset drain is an advantage because it means you can set pans down in the sink without covering the drain, which is a nice convenience (I love my offset drain!). In addition, an offset drain allows more room for your disposal and under-sink items, since the offset drain is not smack-dab in the middle of your cabinet.

Hope I've helped, but I've had to make assumptions on what you were asking about the "italian square sink" vs. "regualar".

I'm guessing that by "Italian" square sinks, GS means zero radius. Ticor in their description does refer to their sinks as "Italian Designed Stainless Steel" but they seem to use that description for all their sinks - not just the zero radius ones.

Right,I guess the "Italian" ones are the zero radius. So, it's really some aesthetic and some functional.

I'll need to see how the offset will work with our setup under the sink. I may just go with centered drains since I know they will work.