Hi Ziyao,
Depends at which level you are at.
If you're a beginner i would say to even get the simple cheap black metal ones called "Bonsai tools"
they are relatively cheap but rust very easily.
If you're more familar with bonsai and have a bit more experience i would definitely recommend gettinig the Ryuga tools, I have them and they are of very good quality and very sharp, rarely they come with a little defect for example being too loose but that is a very minor issue. So i definitely reccomend this brand.
If you have a bit more money to spend then i recommend getting the Masakuni tools. They last a lifetime and are always perfect.
Nick