I have used the miaodao on my main for multiple generations, the weapon (along with the cooler looking dadao) is very capable of dishing out a ton of damage and is pretty basic to use. It does come with a fairly massive weakness when compared to the danish though. The 2h stab attack is insanely good when it comes to fighting in groups, holding ground, feinting, and most importantly defending/attacking enemy cav players. Having recently tried out the danish, those cav fighting capabilities has made going back to the miaodao difficult. It lets you have the advantages of a lengthy spear user with the damage and speed of a 2h.
The danish speed rating isn't a big problem when played correctly, but speedy weapon (katanas/longsword) users can sometimes force you to block twice instead of attacking. If you want, you can hold the fabled "s" key to regain advantage.
I would have to recommend just about any stab-able two handed sword over the dadao when it comes to maximizing the effect you can have in a game. My personal opinion is that you should use whatever weapon you are most attracted towards and make it work. The dao weapons are still awesome, especially after the recent buffs.