Honestly, this is something I see debated constantly. The truth is, for anyone who has run a few serious campaigns, starting with maximise clicks is rarely the right move. Maximise conversions with a target CPA is fundamentally the same as maximise clicks when you set a TCPA-anyone who tells you to begin with max clicks probably hasn't tested both side by side.
People love to cite the 30-conversion rule like it's gospel. But think about it: a massive tech company runs an algorithm that supposedly needs thirty data points before it can figure out what you're trying to do. That's a convenient myth.
My approach? Default to maximise conversions with a TCPA. Look at your average cost per click, estimate your landing page conversion rate, and set your target CPA accordingly. If your CPC is around $50 and you anticipate a 20% conversion rate, set your TCPA at about $250. Then use impression share metrics to fine-tune.
If you're still unsure, don't take my word for it. Run a Google Ads experiment comparing both bidding strategies side by side. The data will tell you everything.