F4LB vs F4LBK

[SC-AW11]

Same price, Which do you prefer and why?
http://buy1.snapon.com/catalog/item...roup_ID=674824&store=snapon-store&dir=catalog

http://buy1.snapon.com/catalog/item...roup_ID=674824&store=snapon-store&dir=catalog

 

[Altec]

LBK. More comfortable.

 

[SC-AW11]

more comfortable is def a good reason. Thank you!

Any others?