We wanted to open a online shop with Bangladeshi Clothing products. I want to done it by opencart. Please suggest us which is the better. <snip>
[FONT=Verdana]Welcome to the forums, shuvo.basak. 
I’m not quite sure what you’re asking here. Are you asking whether there is a better option than OpenCart? It would help if you gave us some more information, such as roughly how many products you’ll be offering, what experience you have with e-commerce or CMSs, etc.[/FONT]
I wan to start ecommerce business.
I want help for selecting products to sell.
What kind of products will give better business…
Women’s Clothing, Lingerie, Baby assessories, massage and bath, electronics accessories, or anything else?
It is totally depending upon the size of your catalog and your budget. Magento is considered as a best ecommerce platform as compare to other opensource providers. You will have lots of plugins and themes available online.