Hi Brian,
On the CLK 500 the Foxwell 530nt runs 43 system checks. However that is dependent on the type and options on the car. My cars are all coupes, so when the 530nt gets to the convertible roof available on another model of the CLK it attempts to run the test, finds it can not and moves to the next. When the scanner does it's sequence of testing it attempts 43 systems on my CLK, but completes just the 29 which are applicable to my car. The same with the Crossfire. I will manually enter either the SLK 320 (170) for the limited or SLK 32 (170) AMG to begin the Foxwell on it's testing/scanning procedure. On the Crossfires I own, both coupes, it attempts 19 system checks, but completes only ten. One of those 19 is the "vero" roof (hard top convertible) on the Mercedes SLK. So it appears the Foxwell will test the Mercedes convertible roof, but how that compares to the Crossfire's I have no idea.
As you have the knowledge to deal with an emulator download and setup, if I were in your shoes I would go for the DRB III emulator as it will certainly give you more capabilities than the Foxwell. The emulator will only be good for your Crossfire and other older Chryslers, while the Foxwell can be used on up to four other vehicle manufactures automobiles depending on which software modules you purchase. The Foxwell is a very powerful tool for under $200 and I'm pleased with it, but I have nothing other than a generic OBD II Ultra Gauge to compare it with. The Foxwell will tell you the trouble code, what seems to be the problem and the control unit, often with it's part number and the name of the manufacture.

I bought a used Dell 3189 on ebay running Microsoft Windows 10 just to download the Foxwell Mercedes module. It is inexpensive, rudimentary computer that is sold to school systems for the use of students, but it worked fine for my needs. Not sure if it has what it takes for an emulator. I am sure I do not want to even try or attempt that download and setup. I see way too many pitfalls and an excellent chance of messing up the Dell to the point I would be unable to use it for Netfex. If we were neighbors you could use my Foxwell. Good Luck!