I had originally multi-selected Guyana and 'other' (mostly by determining in the poll what Anglo-Brazil
would not be rather than what it would) but decided to change it. My reasoning was two-fold and admittedly quite shallow;
1. Mentally picturing the 'closest' geographical equivalent to the OP insofar as an Anglophone (by and by) nation in South America and layering that into my overall thoughts. I confess that this might only capture how English settlement in the Amazon region would look, as the bulk of Brazil's population lies in the Atlantic Forest, cerrado, and highlands between them in the Southeast and coastal Northeast, down to the Southern pampas, and west to the Center-West cerrado and Pantanal. Those regions already have terrain kinda-sorta-equivalents elsewhere that are less challenging to mentally swap for conceptual purposes. Incidentally, much of the Sertão is pretty similar to South Texas geographically/climatically, which I live in so no issues with mental picturing there. And arguably more importantly,
2. A feeling that West Indian accents would contribute to how Anglo-Brazilian dialect(s) would shape up at least in part, based on A) a 16th-to-early-17th Century settlement timeframe, and B) an example of contemporary English dialects evolving and being spoken in the American tropics. For all the comparisons to the Southron U.S. in terms of how Anglo-not!-Brazil would look (which I concur with), I don't think a
modern concept of a Southron accent would resemble that of Anglo-Brazil's except
maybe south of the Paraná and/or the central uplands. Dialectally for Anglo-Brazil I think
Caribbean accents would play a role in the Amazon, along with the
Charleston and New Orleans '
Yat' accents in the Northeast and urban Southeast respectively, partially by development trend comparison, and personal Rule-of-Cool in boosting OTL obscure dialects that share some features.
Furthermore, like I said it was mostly selection by negation. Namely, I thought a Guyana comparison was less-inappropriate compared to Options 1 and 3. For Option One, I can see Brazil in general (both OTL and in AH settings) being a first-world country conceptually, but I am very hung up on any direct comparisons to Canada or the ANZAC countries outside of being Anglophone and possibly a Dominion, assuming such a thing evolves, which I am rather dubious of (still re-selected this option for that 'first-world' status component as a reasonable outcome).
For Option Two, I doubt Brazil in general would be a global superpower, if only because I consider the 'global superpower' concept very unique to OTL at all and imagine the POD would make our notion of the 'U.S.A.' less likely to appear in the Anglosphere in general. For all the talk of how much more successful Brazil might be through more integration in the British economic sphere, I don't think Britain itself would be as inherently successful/better off in the long run; if anything, Dutch disease and wealth from early resource retrieval in Brazil would set England/Britain up for an Edwardian/Victorian-era equivalent of mediocrity to hard luck and outright failure IMO.