Stretchy/Woven wrap around baby slings

[lovemybabyboy]

Hi,
I want to get a wrap around baby sling for DC2 due in 7 weeks, was just wondering:

1. Which is better stretchy or woven?
   

1. Can I buy them in a shop eg. mothercare or is the only option to buy them online? I havnt seen them in shops.
   

Thanks in advance

[lovemybabyboy]

Thank you for your advice, very helpfull.