More or less both platforms have similar features, however they differ in some key aspects.
Shopify: 2% on every transaction by Shopify+ 2% Payment Gateway Fees (Usually Razorpay). (~₹4000 / lakh)
Infobahn: Only 1% – 2% Payment Gateway Fees (Usually Razorpay), No Additional Transaction Fee by InfoBahn. (~₹1500 / lakh)
Shopify: Shopify uses a proprietary software, meaning if you ever wanted to leave Shopify you can take your but not your website. So you will have to re-create your entire website from scratch and re-upload all your products to a new platform.
InfoBahn: InfoBahn uses WordPress & WooCommerce which are open source softwares. So if you decide to leave InfoBahn you can leave with your data as well as your entire website and hire another developer to manage it for you. This is especially helpful when you want to built custom features by hiring a developer. Though there is a minimum billing criteria but you can still walk out with your entire website.
Both services manage the technical aspects like maintenance, security et cetera for you.
Shopify: Shopify offers 7-9 free themes and about 90 paid themes usually costing you $89 to $200/Year.
InfoBahn: Since Infobahn uses WordPress you can use any free or paid WordPress theme on your website. Average cost of paid WordPress theme is $59/Year. For most stores the free themes are usually sufficient.
Apps / Extensions
While both Shopify and InfoBahn E-Commerce offer free & paid extensions the pricing could be significantly differ.
Shopify: The cost of Paid Shopify Apps could range between $5 – $99 per month. A lot of widely used extensions fall in the range of $15 – $25 per month.
InfoBahn: Since InfoBahn uses WooCommerce the cost of WooCommerce extensions could range between $20 – $300 per year. A lot of widely used extension fall in the range of $39 – $99 dollars per year.
Shopify: The basic Shopify plan starts at ~₹2200 ($29) per month + ~4% Per Transaction
Summary: ~₹2200 + ~₹4000 per lakh
InfoBahn: The basic InfoBahn plan starts at ₹1249 per month + ~1.5% Per Transaction
Summary: ~₹1250 + ~₹1500 per lakh
Shopify is a good software but it could be expensive in the long run, in terms of transaction fee, premium themes and shopify apps.