noun
BAD : In my new job I have to make a lot of important choices.
GOOD : In my new job I have to make a lot of important decisions.
BAD : Please will you let us know your choice by the end of the month.
GOOD : Please will you let us know your decision by the end of the month.
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When you pick the person/thing that you want (from a range of possibilities), you make a choice : 'Her parents are not happy about her choice of husband.' 'Oxford was my first choice, but I didn't get the grades.'
When you make a judgement about something, especially after thinking carefully about it, you make a decision : 'Although the job offer is attractive, I'd like more time to make a decision.' 'My decision to leave school at 15 was the biggest mistake I ever made.'