it's time had better would rather

would rather
had better
it's time

would rather = preference
wolał(a)bym ...

would rather + infinitive

I would rather forget about it.

Wolałabym o tym zapomnieć.

would rather + osoba + past

I would rather you didn't do it.

Wolałabym żebyś tego nie robił.

It's time = something we should do
najwyższy czas

it's time + osoba + past

It's time I took a break.

had better = advice or personal obligations
lepiej, żebyś

had better + infinitive

You had better study. Tomorrow is a big day.