Will the eCommerce platform help in achieving more success when compared to eCommerce marketplaces?
Both, selling on eCommerce marketplaces and on your eStore are profitable. Each one of these has its own advantages and disadvantages.
With marketplaces like Amazon, you benefit from the customer base, no marketing efforts, no worries about security issues, and payment gateways. It also carries disadvantages like over competition, listing fees, etc.
Building your own website comes with advantages like direct communication with customers, creating your personal brand, etc. Also, shortcomings like lack of logistics capabilities, additional costs in building, and marketing efforts do not show instant results.
A smart way out is to have your own website built and integrate marketplaces into your eCommerce platform. This way, you benefit from your individual brand identity and have added advantage of drawing traffic from the marketplaces.