which is better for just using with a sleeping bag and a pack as a shelter the 9'X9' or the 12'X12'

Tech Specs:

Material:

Polyester taffeta 

Dimensions:

144 x 144in (366 x 366cm), 144sq ft (13.4sq m); 192 x 192in (488 x 488cm), 256sq ft (23.8sq m) 

Packed Size:

5 x 23in (12.7 x 58cm); 7 x 25in (18 x 64cm) 

Tie Points:

4 

Pole Included:

No 

Weight:

2lb 8oz (1140g); 4lb 11oz (2130g) 

Recommended Use:

Mild weather shelter, sunshading 

Manufacturer Warranty:

Lifetime 

Country of Origin:

China