Samsung comes in a close second in terms of tech. GloFo is also still floating around though lagging pretty bad AFAIK. Micron has it's own fabs that they are actively developing (in fact, they are building new facilities right now).
What TSMC is is cutting edge. That's why everyone that needs top performance uses them.
GloFo simply decided to stay at 14nm because beyond that, manufacturing costs actually increase, not decrease, and everybody wants the best, not second best.
They are now but they weren't always. I don't know much about hardware these days, I gleefully walked away from embedded development over a decade ago, but what I believe is that you don't really want to forecast to hard on any single player too far into the future.
Samsung comes in a close second in terms of tech. GloFo is also still floating around though lagging pretty bad AFAIK. Micron has it's own fabs that they are actively developing (in fact, they are building new facilities right now).
What TSMC is is cutting edge. That's why everyone that needs top performance uses them.