Of my 5 guitars, two of them are 12's
A 1968 vintage EKO Ranger 12-string (recently renovated and as good as new) and a much more recent Takamine EG523-SC12 Jumbo with cutaway.
The EKO is so sweet a sound but never loud when played unplugged. The Takamine has enough sound for large rooms unplugged and a wonderful preamp that gives brilliant results through a sound system.
I play the Takamine most as it is quite versatile but I love my EKO as she and I were first introduced when I was still at school!