Explanation of aosp Rom differences?

Are there any MAJOR differences in all these trillions of AOSP roms? Not trying to minimize anyone's work... So far I just haven't been perceptive enough to see a formidable distinction... Any one Rom in particular worth a shot? Thanks :)

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Firmware differences between F350S & D838?

Hi guys,

I just got a F350S from eBay and I was wondering, other than removing the sk telecom bloat, what differences & advantages are there to flashing it to the D838 firmware?

Verizon Note 4 harware version differences - N910V.05 vs N910V.06

I just got a replacement phone (my last one was so laggy/buggy/overheating even after factory resets)

The new phone (new in box) was a different hardware version then the last one.. N910V.06. Does anyone know what the differences are between N910V.06 and N910V.05 (my old phone)? I can't seem to find any information on the web regarding it..

Thanks,
-mark

TWRP/partition differences and trouble with custom roms

So I'm switching from a g920f to a g925t and am having trouble finding any info/understanding why the g920f had a single system partition, but the g925t seems to have a system r/w AND a system r/o?

Also, I noticed that the first time I booted into TWRP, it prompted me with a couple of options that I have not been able to get back to - even after flashing back to stock using ODIN and starting all over. Seems like ODIN is not resetting everything completely back to stock?

Moreover, I can install a custom rom from the unified section, and it appears to be fine, but if I do a backup and then try to restore, I start having all kinds of problems.

What am I missing? Is the g925t just not that well supported?