Tiny I have owned all of the guns you asked about:
Garg -great phantom style nelson gun, smooth, and with the break in complete they get to be buttery smooth, nice tool free feild stripping.
Grey Ghost - good entry level nelson SC gun, has an open class feed available, tool free stripping for the basic stuff, syder threaded barrel kinda of eh . . . good trigger and feel.
Carter guns - all are more or less hand fitted, especially the older ones. I love mine, I have had a great mini comp now sold, a mini buzzard now sold, an older buzzard that I love, and my baby duck. all are great guns but being hand fitted they do need TLC to make them run their best.