kianat, is it going to be your first Chanel? If it is then I do recommend you to go for something more classic (the GST in this case). To me, the GST is more casual while the Cerf tote is more professional. I wouldn't wear anyone of them to a NICE dinner (by which I mean business casual attire b/c those occasions are reserved for clutches and smaller classic flaps). But as you were refering too REGULAR dinner (meaning you can wear jeans to those events then a cerf tote would be a lovely choice). If I ever have to choose between those two, I would definitely go for the GST.