The verdict
For a small team selling software or digital products worldwide, I would pick Lemon Squeezy. You start selling quickly and the tax question is handled. Read what the vendor says about its future under Stripe before you build on it.
If pricing is part of your strategy, pick Chargebee. Usage charges, credits, several plans, custom enterprise terms and quotes are where it earns its place, and you can change pricing without engineering work. It also suits teams that want to keep their own gateway.
If you have only a few flat plans, neither may be right. A simpler tool such as Stripe Billing can do the job.