I've used Clover, I've coded for their POS system, I've used their API. They are far from great. They are owned by CardConnect/FirstData and CardConnect's system is garbage (I tried to switch to them from Stripe, worst mistake I ever made). I've not particular love/loyalty to Stripe but Clover is not a good alternative. Especially if you want to in-person, their terminals are disgustingly expensive and their Bolt SDK is a mess. Their support is somehow worse than Stripe.