This will be my first time voting in a presidential election. I suppose the main difference is Americans get to vote for the president, regardless of who has the biggest party, as well as their Congressional and Senate representatives.
In theory, I like that system of checks and balances, and the separation of powers between the executive and the legislative. So, if someome like Trump gets in, the power he has is limited if the other party has control of House or Senate or both, he can't just run roughshod.
But, by the same token, the modern hyperpartisanism means in these instances nothing gets done. The president's agenda/mandate is undermined because he can't get through the legislative without majorities for his party elsewhere. In previous eras, it meant the finding of common ground and a solution. Not anymore. The opposition becomes the party of "no"
Overall, though, I think it's better than having a single party in charge and then an opposition who can't do anything but complain, as it's been in Britain for a long time now by big majorities for Labour and Tories in plenty of elections since 1997.
Hope that helps! For the record, I've always liked Kamala! Thought she'd have been a good choice in 2020, but she biffed the primary.