That depends on what you mean by "promising". Are you talking about the play-to-earn profit or the rising popularity? Basically, you should took a look at the numbers of people the games have amassed over the years and who currently has the most players if you want to figure out which is most played. But that won't mean their rewards will translate highest among the other games in terms of USD Dollars.
Personally I like AXS but I would probably not invest my own money in it just yet.