Astrogeologist, I choose you!

[GAGA Extrem]

I am pretty sure you get the same amount of anomalies, regardless when you deep scan, so it shouldn't be any difference.

The bigger benefit from the Astrogeologist is actually that you get an exploitable Rare deposit from the get-go, which is pretty vital for higher difficulty sponsors that rely on a steady early income to get anywhere.

...and, yes, you can just save scum by exploring the map and then reload the same coordinates.

 

[GAGA Extrem]

I am not talking about the deepscanned deposits - those are pretty useless, given that the techs to exploit them usually is only 2-4 techs away from the Mohole. The real boon from deepscanning early is the extra anomalies that it uncovers (at least I think it does).

The Astrogeologist starts with a regular Rare Metal deposit somewhere on the map. That's the big boon.

 

[GAGA Extrem]

Probes have a specific early game tech for deepscanning.