The verdict
If you sell software or digital products worldwide and have nobody to run tax registration, I'd pick Lemon Squeezy. If you have a developer, want control of the customer relationship and are happy to handle tax with the tools around Stripe, I'd pick Stripe.
There is no single winner for small teams. It depends on how much you want to own. Lemon Squeezy gets you selling quickly. Stripe gives you more room to grow, with a wide range of products on one account. Because of the ownership link, read what the vendor says about Stripe Managed Payments before you build on Lemon Squeezy.