what Goosly said. I can give you a little Information on the 3x3's I have:
Rubik's brand: don't get it.
Dayan Lunhui: This is an older cube that's a bit lackluster by todays standard but still decent, I personally wouldn't get this.
Dayan Zhanchi: Still good by todays standard, but isn't widely used anymore. It sucks out of the box so you have to break it in and do a lot of work on it. it can pop on looser tensions but I got mine not to pop.
Shengshou Aurora: Its got good turning but corner cutting isn't the best, also it pops.
YJ Guanlong: Its a very cheap cube with good performance for its price.
Fangshi Shuangren V2: This cube was underrated imo, Its got a nice scratchy feel and good performance. However, You may be better off Getting The Fangshi Jeiyun (don't have it) as it is said to have a similar feel but better performance.
Witeden Type C5 V2: Another underrated cube for it's day. It is Unpoppable, near impossible to corner twist and is fast yet controllable. It's largest downfall is that it is a bit catchy.
Cyclone boys Feiwu: And yet another underrated cube Imo. This cube is amazing for ~7$, Its corner cutting is lacking but I don't get many catches despite this. This is a clacky cube with a mid fast speed.
Maru XD: Raw Speed is what makes this cube special, Its just Fast. Its also very crispy which makes it somewhat controllable.
Moyu Weilong: Very good allrounder cube, Can't go wrong with this one.
Moyu Aolong V2: This is one of the most popular cubes on the market, Its a great performing cube.
Moyu Hualong: This is an Amazing cube, fast, slightly crispy and great corner cutting
Cong's Design (Moyu) Meiying: This is currently my main, Fast, has Excellent resistance to popping and corner twisting, decently stable and has the best corner cutting of all the cubes I have.
Qiyi Thunderclap: Like the Weilong, this is another allrounder and has become very popular. Its also cheaper than the average 3x3.
some other cubes I don't have that are also popular are: the Gans 357, Gans 356, Fangshi Jeiyun, Moyu Tanglong, Cong's Design Yueying and the Yuxin Qilin 3x3