Conversion or Clicks?

I have my google pixels setup. Do I use conversion or clicks for bidding? In the training video he said that we can use conversions if we have our pixels setup. But in another video:

He says not to use conversions cause google will spend our budget quickly.

Which bidding option do I choose?

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good infoā€¦

We donā€™t have any other choice in display ads do we??? I just finished that lesson but havenā€™t done the pixels one yet.