Interesting question. This should be in the main forum. Anyway, this is my ranking
Wall of China
2. BP
Besides BTS they are the only group to tour Europe, Oceania etc but weak in Japan
3. TWICE
Best touring numbers by a female group in Japan by far. Strong in US + potentially Asia too. Maybe an Europe tour as well next year. They have grown a lot since their last tour so I can see the next tour covering a lot of countries.
Tbh I don't know much about either of these groups touring. SVT is stronger in Japan, EXO does better in Asia. But SVT can play a couple of arenas too in US something EXO hasn't done for whatever reason. EXO 2016 tour has 700k attendees according to Wiki which is more than SVT's Be The Sun so they are #4 for me. If TWICE's 2023 tour doesn't pull better numbers in attendees and revenue then they are probably #3.