I have personally owned 9 printers, including 2 resin based printers and I would highly recommend the Gcreate gmax 1.5xt+.
16x16x21 inch build area which should be certainly large enough for even the largest cosplay helmets.
Ive owned other large printers like the makerfarm 12" and the taz 5, and not only is the gmax bigger, its quality of prints is much better as well.
I love every thing about it. And no, i dont work for gcreate haha, just love the printer.
here is an unboxing I did so you could at least take a look
https://www.youtube.com/watch?v=rAwgpN7lAoA