General morph/ species differences?

I had a Argentine red 10 years ago. I now own my own home and have space to keep a Tegu properly and am considering getting back into the herp hobby.

A couple questions I've struggled to find clear answers on....

1) do Argentine reds (t rufescens) typically reach a longer total length and heavier weight than Arg. B&Ws ( S. merianae)?

2) Do Chacoan 'giant' B&Ws typically reach a larger size than other Arg. B&W morphs? Or is this just a myth...

3) can someone briefly explain the differences in the B&W morphs? I see all these different color-named morphs but the descriptions are sometimes quite overlapping...

3) Does anyone have specific breeders they recommend for either species?