In reply to beegsyboy:
It really doesn't matter that much.
> Does it matter if I use 18cm slings for Sport as these seem better for Trad?
The only difference is you will fall say 6 cms further. When your harness knot is 5 cms above the bolt if feels like this is important. When you actually fall off from say a metre above the bolt, it doesn't make any difference.
> Also I assume using 12cm closed loop QD's wouldn't be so good for trad, pulling gear out etc?
Sometimes, but not that often. For trad its nice to have mix of lengths but not crucial particularly if climbing on double ropes.
> Just not sure what length to go for, which would work well for both?
Get a mix. V12 are selling prowires (very nice krabs) dirt cheap and letting you mix sling length.
http://www.v12outdoor.com/catalog/product_info.php?products_id=938&osCs...