What is the faster miner for VEIL right now ?
I think all miners are somewhat the same with little to no speed difference. I have been using suprminer for a while now to mine Veil.
The new t-rex version gave me a little hashrate boost, but not much. It's probably no more than a quarter or a half of a megahash. The contributing factor to how much you can mine is what card you are mining with. The fastest card is probably a 2080ti, or one of the new radeon cards.
What the miner itself reports is one thing, personally I also check what the pools are actually getting when you mine. At the end of the day that is what is important.