4x4 cubes

What is the absolute best speed solving cube brand to use for the 4x4. Im not even sure if v-cube makes 4x4 but if they do, i cannot find one anywhere. I currently have a shengshou 4x4 and a lanlan 4x4. My shengshou pops on occasion, i know most cubes will pop on occasion but shengshou 4x4's have a ton of pieces and its difficult to put back together. The lanlan 4x4 has a ball core, but its corner cutting is terrible, not to mention its giant.
 
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