When you throw Flutter into the mix the discussion turns more to ecosystem than language: I personally thing Flutter is a great idea and may end up winning the cross-platform war, although I'm still learning React Native because I already know React--and the apps I'm writing don't need much or any native support not already provided by existing modules.
In the long run something like Flutter will almost certainly win because performance matters; it's just not clear to me if Flutter will be the one.
Yes, it's a gamble but I would wager that flutter is going to be an important part of the android and google ecosystem in the near future.