Best value for money - look for Loyverse POS; https://loyverse.com/
Toast as recommended, already you got the info. I like in particular their blog that is current and has quite useful articles related to our restaurant-running headache 😃 https://pos.toasttab.com/
Have a look at Restohub if iPad system is what you're looking for. https://www.restohub.org/
Advantages are that all are cloud based, easy to manage from back office and have sort of CRM (customer relationship management) built in.
Best of luck!
JaneNedanoski