There’s really no “Best” in the city since everyone’s preferences are different.
I enjoy Yong Kang beef noodles, but it seems like you didn’t like it too much.
You can try these…
One tip I can give you about Lin Dong Fang beef noodles on Ba De Rd is that the earlier you go, the less “broth-y” the soup is. Pople have reported that going early the soup was kind of bland and those that go for dinner or a late night snack have reported the soup having a lot of flavor.
My personal favorite is the beef noodles at Din Tai Feng, however, no one I have ever encountered in Taiwan or from abroad has agreed with me on this haha