Per se Zencart is a advanced version of oscommerce, and basically has all the same features plus covers all the good features which are not there in oscommerce.
The major differences between both the two applications are the template system, Gift Certificate module, which allows the admin to create, send and manage the coupons. It also has a module to sell downloads (media or pdf files).
I have customers who love oscommerce, so we simply upgrade it to its latest version 2.3.1 , I personally I like it a lot specially the graphs part where is shows the visitor and sales stats
But having said that, let me explain the features of zencart:-
Bottom line every ecommerce application has its ups and downs therefore it depends upon the developer on how he or she uses it wisely to make the actual sales needed to happen on the website.
I personally focus on search engine friendliness of a application, if the application has it then it is a good choice for me to go ahead and build it since my developers can add the required sales features for it
Our job doesn’t end by building a website for you, but it just gets started, we focus more on promoting your website and use the best search engine optimization techniques ever possible
To enquire our prices, contact us.