This is the million-dollar question for anyone with a toolbox full of T20 bits. Here is the definitive answer:
To make things more confusing, Torx Plus fasteners come in two varieties: difference between t20 and tx20
Based on the search term, the comparison is almost certainly between : the older Form 2 (often abbreviated as T2 in informal settings or confused due to the "2" designation) and the newer, current-generation Form 3+ (part of the T ech X -generation lineup, often abbreviated as TX ). This is the million-dollar question for anyone with