Nobody really does tablet hardware reviews with latency / position tracking tests. Google any pen tablet and you might find a photo editing review talking about ergonomics and photoshop compatibility.
XP-Pen, Huion, and Gaomon are claiming 266hz USB report rates for some of their newer tablets. Wacoms USB rate is ~133hz for Intuos/Bamboo, ~200hz Intuos Pro. Good luck finding comparative performance measurements of these unless you buy them and test them yourself. (If you do this, please publish it.)
Hardware latency prior to USB transmission is a mystery on all of these: it /should/ be low, but some tablets have poor designs that add pen latency or position smoothing latency, and mostly nobody is measuring this unless a tablet is so bad that people get pissed off (like the CTL-490).
Hawku tested a few tablets a while back;
http://hwk.fi/TabletTest/, of these, Wacoms had the best tracking and XP-Pen came a close second. XP-Pen's G640 has great tracking, a low price, and a 250hz+ USB report, but it also has hardware-based position smoothing, which adds significant latency and makes it not a 100% upgrade over Wacom's lineup. Unfortunately, Hawku hasn't tested any newer tablets.
If you have a CTL-480, there's no point changing tablets unless you have a 144hz+ monitor and feel like burning some money: Wacoms send USB packets faster than a 120hz monitor refreshes, and have reliable position tracking.
