I prefer the Gundlach but I have that same Model A Crain and it's the next best thing. Seems lighter------not sure. I've popped the blades off both and used the same diamond sharpener I use on my heat welding skiving knife to bring back the newness for some very fine cuts with VCT.
Generally I score and snap LVT as it seems quicker to me.
Some of the heavy duty finishes they put on the commercial LVP---Amtico for sure can tweak the crap out of your blade. It's not that it dulls the blade so much as twists it out of square/true. It wasn't just the blade either. They had dorked up the entire mechanism. I don't know if I could fix it either unless they let me take it home and dissassemble it
I never did it on MY cutter but I've seen a few guys who forced the issues and REALLY leaned into the handle to make the cuts. Yeah, it cut the planks but a few weeks later when they tried to use it on VCT the damage was very obvious when you tried to cut back on the field tiles or re-make a factory edges like you have to do to get 3-5 cuts out of a single tile along a long wall in an irregular layout.
I've actually got 2 Crains and 2 Gundlachs in various states of disrepair. I do a lot of tile.