don't know much about the tasmanian wood but it looks nice. ebony tends to crack, too, so I'd probably take a chance on the blackwood (though it looks like the grain may have an impact on the smoothness of the piece, whereas ebony is smooth... just something else to consider)
which HOS set do u like? why?

I love the HoS Margate Series. That would be my favorite. Next would be the Kiev Series. I have them both in boxwood and golden rosewood.

Even though they are out of stock. Their Modern Series Chess set is a nice economical set. It's like a Modern Day Bohemia set with German style Knights.
https://www.houseofstaunton.com/the-modern-series-chess-pieces-3-75-king.html

I like the two sets I mentioned in #3 because I favor English and Soviet-style sets. I also like the Margate because you get two different styles of Knight. That and the extra queens mean the set has 38 pieces!

Yeah I saw the Margate set in person at a tournament. It is a lovely set. My opinion about sets with different pairs of Knights. Is one pair is lovely while the other pair is the ugly red headed step children. Me personally I prefer the smooth simple Knights in the Margate set over the more detailed Knights. So I would have 4 Knights doing nothing but collect dust. I get the idea of having 2 different pairs of Knights. Just not the reason. However my taste might not be your taste when it comes to Knight design.
https://www.houseofstaunton.com/the-margate-series-chess-pieces-4-0-king.html
If I have to choose HOS then my choice would be The Steiner:
https://www.houseofstaunton.com/the-herman-steiner-commemorative-chess-pieces-5-0-king.html
It is the closest reproduction to the classic Piatigorsky sets. However their price is outrageous. Beautiful and graceful.

I love many sets from HoS including Collectors 3.75 and 4.0 both in wood, Fischer Spassky Commemorative, Leeds, Zagreb 3.875 and probably a few others. The one I really like now is the Cooke Luxury in mopane because it is a Cooke set where the stems of the pieces are thin and the bases are flattened. It also comes with the knight designed by Frank C. https://www.houseofstaunton.com/camaratta-signature-series-cooke-luxury-chess-pieces-with-boxwood.html.
https://www.houseofstaunton.com/the-leuchars-series-timeless-chess-pieces-3-5-king.html
(blackwood)
or
https://www.houseofstaunton.com/the-leuchars-series-timeless-chess-pieces-3-5-king.html