I did experimented across all the available options, here are my thoughts,
β’ when you are not sure on your ad copy and you launched something new, in that case optimised for the best works well, as Google tries to show the ad more getting more interactions and the metrics like CTR.
β’ But at the same time, many times we know what copy will work for an ongoing campaign or where we have some good experiences
, there you can rely on choosing the ads evenly or if you plan to keep the ads like you want to get impressions on all so you can keep that too. So itβs more of depend on your objective too.