You misspelled Paymill, which is in fact an exact and shameless clone of Stripe.
Braintree is similar, but it evolved from an pre-Stripe type of an older convoluted platform. They still had tiered pricing just a couple of years ago. It is also owned by PayPal, so that alone can be a factor for some people to sidestep it.
Yes, there is also Paymill. And frankly, I don't care if something is a "shameless clone". I do care about whether I can do business. Ever since Stripe was created, it did not want my business, and to this day I cannot use Stripe.
Which is why I use Braintree and tell people to use Braintree or Paymill.
Braintree is similar, but it evolved from an pre-Stripe type of an older convoluted platform. They still had tiered pricing just a couple of years ago. It is also owned by PayPal, so that alone can be a factor for some people to sidestep it.