I am penhold player and use it on BH with Fan Bo - Seven wood blade. My FH is H3 hardness 41. This rubber is very good control, fast block excellent direct the ball to where I wanna hit. My BH loop and short flicks are improved more accuracy. Corner to corner loop and block are much easy with RASANTER R50.
It takes time to get used to hard rubber. You need few months to get hands on it, keeping practicing. After two months, your loops are faster and more spiny with this rubber. I think that R47 is much easy to play at first time. Just try both, stay the one good for your BH....