CartFlows is based on WooCommerce, but Mango is not.
a) If you wish to support subscriptions, you have to purchase WooCommerce add-ons like WC Subscription which alone costs $199/year. With Mango, you connect directly to Stripe (or PayPal) and there's no extra costs.
b) WooCommerce is extremely complicated to setup and has a lot of bells and whistles you may not really need. Mango is meant as a light-weight solution to enable you to accept payments (or subscriptions payments) fast.
CartFlows requires you to setup a lot of things before you can use it (products, fields, tags, scripts, etc.) - not least because you are dealing with WooCommerce. With Mango, it's literally point and click and connecting the sales funnel flow. It takes you 5 minutes once your landing pages are ready.
CartFlows lets you build only simple, linear funnels. That is, if a customer behaves in different ways as he steps through your funnel (i.e. he decides to purchase or not purchase a certain product or upsell) , you still lead them down a linear path. With Mango you can actually create complex funnels that enable you to branch into multiple paths (trees) within each step.
With Mango you can have multiple offers on each step - on the same page - not just 1 as with CartFlows (I am not talking about order bumps or upsells, but actual products you're offering on the same page).
With Mango, you can accept one-time payments and subscription payments at the same time (Stripe). I have used this myself many times as part of one-time "activation" fees.
I believe everyone should have the flexibility to use whatever they want to build their site. And with that I don't believe you should be slave to "conversion templates" from a single source - there's a million better ways to create your landing pages that honor your brand and are extremely fast and easy to create. That's why Mango gives you the flexibility to use it with any WP editor or theme. What happens if you need to switch your site design/theme tomorrow? With Mango, you can still work with any of them.
You can automatically switch user subscriptions mid-funnel without lifting a finger. Something I have not seen anyone offer. This is really useful if you offer subscriptions and you want to upgrade them automatically from one to another during your funnel (you're able to do that at ANY step).
You can re-use landing pages for multiple funnels. Why is this useful? It enables you to create multiple funnels that can use the same resources you already built. Want to up-sell another product for which you already have a landing page in one flow, but want to use it in another as well? Well now you can without having to recreate it.
In the way Mango is set up, you can do multi-variate and A/B Testing using best-in-class services like Optimize (from Google) for free. You can be sure you're getting the best kind of testing options for your landing pages.
With Mango, people cannot hijack your sales funnel. What do I mean? I mean that there are people that will try to start mid-funnel and purchase some of your products or services without having seen the other offers. With Mango you can ensure no one hijacks your funnel, because they must use the dedicated funnel setup created.
I have not seen any third-party integrations on CartFlows. With Mango you can send any new customer data to your CRM or other services so you can be in sync. There are over 12+ native integrations already and counting including Zapier & Integromat, which let you sync to 1000s of other apps
