I'm looking at the Kinsella catalog again and i noticed that stonehenge comes in 2 weights, 250gsm and 320gsm...is there an advantage to getting the heavier weight paper?

Stonehenge

White(01), Wm.White(02), Cream(05), Natural(03):
22"x30" 250gsm $ 1.39/sheet 100 $127.00


White(01) (Heavyweight):
30"x44" 320gsm $ 2.99/sheet 50 $138.00