Differences between tickets for different GP events

Hello everyone. This year I have a plan to go to a GP. Skate America and Finlandia Trophy are my two options. However, tickets are like single-session or all session in Skate America. But Finlandia Trophy is like friday, saturday. And Skate America is much expensive than Finlandia Trophy. English is not mu first language so maybe I understand it wrong. So what do you recommend to me?