We are switching from SOAP to REST and I am asking myself which implementation/class is the best: HttpClient or RestClient? Which one should i choose and why?

I started with RestClient but run into difficulties loading a file (octet-stream) into PowerBuilder.
The following works fine as long as the request returns a string into ls_json. It works fine with text files. But when the request returns a PDF file or similar it fails.
    inv_restclient.SendGetRequest(ls_url, ls_json)

I found out that HttpClient offers the possibility to return a blob which works perfectly:
    BLOB lbl_filecontent
    lhc_HttpClient.SendRequest("GET", ls_url)
    lhc_HttpClient.GetResponseBody(lbl_filecontent)

With other words: so far HttpClient is my first choice.

Which way have you choosed? And why?

Kind regards!
Olaf