What is the best cross sell module to use?

I know there are several cross sell modules available to download but I am a little confused about which one would be the best to use. I am using the latest version of Zencart and I want to be able to cross sell batteries and other products on my site. I would like a module to that will display related products with a buy now button on both the product page and at the shopping cart page but I really don't know which one to choose. Can anyone recommend using a particular add on for this?

Thanks in advance. :unsure:

It's a toss up between the two and I would read the support threads on both to make a decision or PM the creators... And make sure they are compatible with 139h, and if not use Winmerge to compare if the modules touches a core file..

http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=1837
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=1677