PSA vs BGS vs CGC - Grading Quality Question

I know this is probably beat to hell already, but I can’t seem to find a very clear answer with evidence.
Who is grading the hardest right now?I’d like to get a Rainbow Rare Zard VMAX in Black Label, and I’d like to do this through crossover.
I’m trying to collect a few select cards in Black Label and want to purchase graded singles with the best chance for Black Labels.
I personally pulled that above mentioned card, but I’m not confident it would get the Black Label, so I don’t want to send in the card to be graded and waste time. When I could’ve just sold the single for around $450 and use that towards purchasing a graded single.
I’d love to know your thoughts and opinions, picture evidence would be great too!