I have an NEF 10g and my buddy has an NEF in 270 and 223.
The NEF is not really a switch barrel design, so it is apples and oranges. You can't buy a 2nd barrel as easily as you can with TC. Also, NEF performance is hit or miss. My 10g won't eject shells at random, my buddies 223 strings shots after 3-4 shots.
My TC on the other hand is a tack driver in 308 and 50cal. Much better fit and finish overall.
If you need a gun today, get what you can afford, but if you can wait, buy a TC, or look for a used one in any available caliber and buy a barrel for it in 50cAL. There is no shortage of used guns out there.