What ecommerce platform allows the most customization?

This is an interesting question. After all, it's all about ROI. What we invest, we always expect more than that. The same things to be consider for choosing the platform for eCommerce website development. There are hundreds of eCommerce platforms - as you have already given few examples among others.   We can differentiate all these platforms by their level of customization, features, pricing, and the marketing capabilities they offer.   Let's see your criteria and above criteria for key platforms outside, go for one which fulfill your requirements.   This is my recommendation, it's fully customized solution (e-Smart eCommerce Suite): http://www.kaushalam.com/custom-ecommerce-development.html

The most customizable ecommerce platforms generally are those that are self-hosted like Magento or WooCommerce though that might get expensive depending on how extensive the modifications you want to make. Something like Shopify might be worth looking into if you want the stability and generally better features and pricing.I run an eCommerce review blog at http://AlternativePlatformSolutionBetter.tumblr.com where I further discuss popular choices for running an ecommerce website. Be sure to drop by to learn more about those you may want to use.Disclaimer: I customize ecommerce software for a living

Shop2grab http://shop2grab.com is only one eCommerce platform in India which allows you to customize the platform based on your need. Which 100s of features and and application prebuilt including android application and facebook store allows you to scale your business to the next level. Disc - I am from http://shop2grab.com

It really depends on what customizations you are looking to implement. I'd suggest an open source platform like http://www.magentocommerce.com/.

Magento is a great platform because it is entirely customizable to meet your specific needs. It is also available in different flavors to match specific needs, Magento Go is a SaaS based solution for small merchants while Magento Enterprise is for large retailers who require a scalable platform customized to their needs. The major advantages of Magento are the huge developer community, availability of plugins for integration with various other products (CRM, ERP, Analytics, E-marketing) and product stability.

I know a ecommerce portal http://www.ecbilla.com/ which allows you to create an online store within minutes and provides customization for your estore. They provide http://www.ecbilla.com/features/ which allows you to create beautiful store front, customize your shipping options, view reports, create and manage discounts and offers and use CMS to manage your store contents. It allows most customization that enables you to build your online store in a way that you like. It makes use of innovative technology with user friendly designs for theb templates they offer.

I am definitely sure about this that Apache OFBiz allow most customization, as its opensource and many company have modified it in different way according to clients need. I also have modified it many times. With ERP, CRM, Marketing and E-commerce at same place, its a boon for e-commerce. Many of big stores are now running on OFBiz, having millions of turnover each year. Its best aspect is its flexibilty/customization power.

Out of the three you mentioned, the first two don't allow you to customize checkout and the third is shutting down. Check out LemonStand if you're looking for a fully customizable hosted eCommerce platform. We allow you to customize everything - from the URLs to the checkout funnel. Head over here for more information - https://lemonstand.com/features/customize

Apart from the options that you yourself have provided, I would like to suggest you platform that i know is dynamic and with it's huge customer-base and expertise offers customization to it's client varying on their product and the sector they are dealing with. Visit http://www.iqecommerce.com/ for more details