Side bars with steps , which ones??

Righto peeps im in the market for some side bars with steps so the nippers can get in and out easier but dont know which ones to choose out of these or others:

http://www.vanstyle.co.uk/van/product_info.php?products_id=712{170}516


http://www.tradevanaccessories.co.uk/vauxhall-vivaro-side-steps-bars-viper-bb005-76mm-swb-2001/...

Side bars with steps , which ones??