I have checked the datejust ARF, there are 2824Movement and 3135Movement. Pls tell me which one is better?
^^ a little bit of ritualistic hazing up above lol. Only because even us newer members have seen questions such as these dozens of times.
To answer your question, the 2824 is a clone of an ETA movement, which is possibly the most ubiquitous automatic movement around. Very reliable. The 3135 is a clone of a Rolex movement. Not as reliable because its... well, a chinese copy of a unique and sophisticated movement. Also, the 3135 is for the 36mm datejust, not the 41mm.
What I suggest is read and read and read because this hobby isn't for everyone- or at least, there is a steep learning curve.