Welcome to the forum
lsoleman.
Doll buying is certainly a deep rabbit hole. Especially with some many options.
Weight is the first and most important thing to consider. As a 38kg small box say is obviously a different distribution of weight to a 38kg girl. Same goes for a human, you may be able to pick up a human of similar weight, but our girls (and boys) can't - or rather won't, help you in carrying them, so they will just stay perfectly still and expect you to do everything for them.
Another thing to consider as well, is the hands. Whilst wired fingers are ok, they do break easily and then you get "spaghetti" fingers, which isn't a great look.
As far as I recall you have:
Wire to arm
Wire to wrist plate
Articulated V.1
Articulated V.2 - ball jointed, (not had experience of these as yet).
Both my girls have V.1 fingers and they are great for posing and only pose how real human hands would pose. I've had wire to arm and wire to wrist before and they are pretty fragile, but do work if you are careful.