If it helps, I've yet to use a shaving cream that doesn't lather up to an extremely good lather. T&H, GFT, TOBS, Vulfix, plus a couple of samples all turn into an excellent lather. They're all reasonably easy to work with, and as long as you're not stingy it's easy to get the cream/water mix right. I don't notice any shaving performance difference between them - although I'm too new to DE shaving, and I change everything else too much to be able to tell properly.
Something I do note though is that some shaving creams are looser than others, which to me suggests I'll get less uses from them, however I've not investigated that much.
I did get a bottle of T&H grafton shower gel and TOBS Mr Taylor's hair and body shampoo today. TOBS would appear to be much runnier, so it won't last as long. Perhaps there's something similar happens with the shaving creams?