Absolutely. PayPal's user experience is usually (though not exclusively) offsite though. Trolley gives you a Stripe Checkout-powered on-site checkout.

Right now, Trolley seems to appeal to people who want to do business with Stripe instead of PayPal.

In the future we may well add PayPal as a payment backend in between rolling out our added value like digital downloads, subscriptions and the other cool stuff we're planning :)