It really depends on the competition. There are some cases when Exact Match is more expensive but more cases when it is cheaper. Exact match gives you the best quality score since you are literally bidding on that exact query.
I would always recommend bidding on both since quality score will be highest with exact, and you can get in front of any relevant search query with phrase or modified broad.
Also, I have tested and seen great results with bidding on straight broad keywords and utilizing the Google algorithm to optimize for a certain Target CPA. Defiently worth testing if you have enough conversion data in your account.
It really comes to what keyword is providing the most value. I don’t usually care if a keyword has a super high CPC but also leads to efficient conversion volume.