I disagree with the above edit.
5x5 expert - moyu aochuang gts m, qiyi wushuang m, yuxin little magic m // ylm is not the best on the market. its good, but not the best
6x6 great - yuxin red // current list has a shadow, this is a step down.
6x6 expert - Moyu Aoshi GTSM, XMD shadow m, yuxin red //yuxin red is objectively worse
7x7 great - cyclone boys G7 //budget big cubes are a joke, at this point youre better off getting a spark
Skewb great - cyclone boys magnetic // fair, but wingy belongs here
Skewb expert - XMD wingy, moyu aoyan // aoyan is objectively better (and I only own a wingy), read the descriptions for what each category stands for
Megaminx great - YJMGC megaminx, Shengshou pearl m// any non-galaxy mega is a joke for anything above the budget category
Square-1 budget - qiyi Qifa sq1, mfsq1 //Yuxin is cheaper and better, and for only 3 bucks more you get the best squan on the market