Actually I think Yu Heyi used H3BS on his FH and not B3. It's disappointing for sure. So you are not wrong at all with your assumption.
B3 Tiger 4 and Purple don't stink that much, so they are OK. I wouldn't say they smell nice either but they clap H3 and many Chinese rubbers by smell.
I think the purple is comparable to D09c or H8-80, but I would take the B3 purple because of weight, speed, and topsheet quality. The sponge this time is really great too.
I don't use any booster with these so I can't say. I can say the purple sponge has a quite serious negative curl from the pack, so the gluejob is a bit iffy, but it's manageable for experienced gluers. Tiger 4 has no issue like this.
I think the Tiger 4 has a similar issue like I said before, it has some sponge coat that makes the glue not stick first. So one either uses a booster or glues it virgin then rips off the glue and reglues again for proper contact.
B3 topsheet is the best sticky topsheet I have ever met. And now there are many options to choose from.
I think B3 Tiger 4 for FH and purple for BH are probably pretty sweet choices.
I hope the pricing will get down but even if 729 charged 80EUR I think the would worth it, at 40EUR they are a steal.