Sniffer will give an incomprehensible plant. The new plant will make sense if it is related to the theme of 1.20, namely, farming, gardening, etc. The sniffer model is too bright and tasteless. According to the lore, the sniffer does not fit into the world of minecraft (there were no mobs that would be declared extinct).
The tuff golem is inherently completely useless, it's just an attempt to appeal to the feelings of the copper golem cheerleaders last year.
Rascal, although it implies a possibly unbalanced farm, it fits the theme of previous cave updates quite well. I myself somehow dreamed that a certain cave mob was added, which can give valuable items.
But if the sniffer plant is put to good use so that it flows into the game, I will not regret that Rascal lost.