I wouldn't be able to link you a source, or prove it in any meaningful way, but there is circumstantial evidence. Mainly the fact that Pristine is a state attached to the 'system' as opposed to the body. I learned about this from reading what other experienced players had written back when I wanted to unlock Jean and Bill, and learned that if you find a pristine system, supposedly, all the rings AND bodies had pristine reserves. The state of pristine in the game, as opposed to depleted, is supposed to reflect the quality and quantity of materials found in that system. I can easily prove this works for rings (all rings are dropping top metals in a pristine system, not just the rings around one body), I can cite thousands of players and loads of research projects to support that, but I can't lay my hands on any direct evidence that confirms unequivocally that this affects bodies the same way. My experience leads me to believe this is the case, you get far more mesos, gold outcrops and MMs in pristine systems, and almost none in depleted systems.
Regarding body type, again it's anecdotal, but I can give you a couple of additional 'side-effect' reasons to favour metal rich bodies... 1) They are almost always close to their stars, which means you arrive quickly, and 2) they almost all have decently high gravity, which makes driving and collecting easier (drives me nuts waiting for mats to land on low grav bodies!!).
I 'believe' but again cannot prove, that the body type determines the quantity of node spawns with Metal Rich giving the most nodes over time and rocky body the worst, and the state of reserves determines the chances of getting mats in the bottom half of the table for the body (and therefore, what kind of nodes you get primarily).
I have also compared inside craters vs on the outside edges of them recently, on the advice of Morbad (which was to look on the outside edges), and I concur with him, I used to look inside craters mainly and around the central mountains (if they exist), and this is a good way to get MMs to spawn (particularly around the roots of the mountain), but it's difficult to drive around the feet of mountains cos rough ground. Since then, I started looking for where 2 craters overlap like a Venn diagram, and then look around the points of intersection on the outer edges (the rims) of the craters. Since I started doing this, my prospecting time has definitely become more efficient.
You can weight that (evidentially) how you like, but I will advise people to use EDDB to identify pristine reserve metal rich bodies and look around the outside of where two craters intersect for best chances, and be confident that I haven't reduced their chances compared to whatever else they've been doing.
Lastly, regarding other nodes spawning what you need, that's great, but the top mats (antimony/ruthenium, etc), are very rare from grey outcrops, chondrites, and even gold outcrops. They tend to fall much more commonly from mesos and MMs. Such that if I'm looking for Antimony, I will generally only crack open mesos and MMs (and gold outcrops always, cos they make it rain mats, lol) and ignore chondrites and outcrops.
The tone of your post is a bit derisive, I don't really know what I've done to earn your contempt, but please understand I'm not trying to make myself out to be an expert, I'm just telling others what worked for me. I just want to help. If I wasn't confident or didn't care about what advice I was giving I wouldn't write in so much detail about it.