Focusing aids for Chamonix 4x5 cameras

[Kornscharfsteller]

I am about to buy my first large format camera. It is going to be either the Chamonix C45F-2 or C45H-1 (I am still undecided, I will kindly ask for your help on this topic too in another post).

JOBO, the German Chamonix reseller offers many different focusing aids made by Chamonix. I will for sure get a classic dark cloth (not offered by Chamonix) and I already got the Chamonix-JOBO „artisan“ focusing loupe.
Now my question is which of those other focusing aides should I get? What are the applications, ideal situation, advantages/disadvantage of each of those different things?

1. CV45F Viewfinder 4x5”


2. CV45FC Viewfinder 4x5” - carbon


3. CV45RX Reflex-Viewfinder