- It helps to link 'worse' to 'between' and 'worst' to 'among'. Between two choices, one will be worse. Among multiple choices, one will be the worst.
- It also helps if you define 'worse' as 'less good' and 'worst' as 'least good'.
Consider how many things you are comparing.
Use 'worse' if you're comparing two things: "I think eggplant is worse than squash, but that's just my opinion."
Use 'worst' if you're comparing multiple things: "I disagree. Eggplant and boiled cabbage are both vile, but squash is the worst!"