On impulse.
Wait and see.
Go along with others.
It feels right.
Leave it to chance.
Think it through.
Least risk.
You delay the decision for as long as possible.
You toss a coin to help you with the decision.
You follow your gut feeling about the situation.
You take the safest alternative.
You follow whatever comes into your head.
You look at the options and decide carefully.
You follow a popular trend.