For the TFX you can use the same Virtue Crown speed feed that fits the rotor (with minor modification).
I don't think you will be disappointed with any of the the three unless you have a very specific need. 260 capacity, Spire or Rotor. Profile TFX. Weight TFX (I think). Capacity change Rotor #1 (out of the box), Spire #2 (with extra shell purchase).
We have a TFX, Rotor V3 and Rotor R2, Pinokio Speed, Halo2. Favorites are the later model loaders. I would like to have a Spire but I think I have too many loaders already. Favorite TFX but I don't have much time on the R2. The V3 was/is a tank, just too small on the capacity.
loader thread #1
loader thread #2