The major reason I use Paddle over Stripe is Paddle deal with all EU VAT and other country specific tax + admin for you which Stripe still don't (as far as I know). If you're a small team or solo, you really don't want to be burdened with the extra work here and the scope for complicated and scary tax related mistakes.
Each month Paddle send me a single payment and I record those as business income - that's it, done.
Edit: Pricing is 5% + $0.50 per transaction. As far as I know, Fastspring is more expensive and Gumroad is cheaper, and both take care of tax for you the same as Paddle.